• DESIGN: OSD Audio’s Pre-1 is a unique preamplifier that accomplishes the subtle audio tasks that takes an ordinary audio source management to the next level.
• SOUND QUALITY: The Pre-1 assists in experiencing a true home theater surround sound. It allows the ear to hear every detail for an enhanced audio environment.
• POWER: A low frequency filter gives a response of 5Hz-30kHz +0 -3dB in order to have the ultimate powered preamp for a home recording or stereo system.
• CONTROLS: The front panel has adjustable mic level control, input selector, microphone jack output, and mute option. It controls the bass for midrange, treble, loudness and balance control.
• SIGNAL: A preamp is an important element for music recording to boost the low-level output on microphones. It provides a better recording signal compared to standard equipment.

User questions & answers

Question:	How would this work with a Carver M1.5 amplifier
Answer:	Yes
Question:	Can i hook it up 2 a Samsung vintage amplifier
Answer:	Yes
Question:	It is possible to amplify or equalizer the output earphones of one old tv to couple my yamaha r-s700 (3.5mm to rca connect
Answer:	No
Question:	What are the specs on this preamp? what is it's s.t.n.r. on the cd output and what is the t.h.d. percentage
Answer:	Yes

Product features

RECORDING

OSD Audio’s Pre-1 preamplifier delivers benefits to music recording by boosting the low-level output on microphones.

INPUTS

The OSD Audio preamp provides 4 selectable unbalanced analog RCA inputs: Phono, AUX1, AUX2, and CD/DVD with a ¼” Mic input jack on the front panel, featuring an adjustable mic level control.

KNOBS

The Pre-1’s other front panel variable control knobs feature 3 tone controls: Bass, Mid, and Treble, plus Balance, Master Volume, and Loudness Contour Knobs with Min to Max settings.

CONTROLS

Additional Pre-1 front panel controls include a Power Switch, Tape Loop, Mono/Stereo, Low Filter, and Mute Buttons.

OSD Audio Pre-1 High Definition Preamplifier

OSD Audio’s Pre-1 is a unique preamplifier that accomplishes the subtle audio tasks that takes an ordinary audio source management to the next level. A preamplifier is a low-level amplifier. It takes a line level signal and amplifies it enough to drive the power amplifier to its rated output. If an amp is receiving a signal at its rated output, it will perform better and your surround system will pick up detail you never thought possible.

Product description

Pro Audio Bluetooth Pre-amplifier Receiver System - Digital Rack Mount Studio Preamp, Recording Mode, FM Radio



Features:

• Rack Mount pre-amplifier Sound Receiver System

• Bluetooth Wireless Audio Streaming Ability

• Unique Recording Mode Saves Audio via USB/SD Port

• USB Flash & SD Memory Card Readers

• Aux (3.5mm) Input Jack

• Connect & Stream Audio from External Devices

• FM Radio with Digital LCD Display

• ID3 Tag Readout Displays Song Title

• Multi-Source RCA (L/R) Audio Input Connectors

• RCA (L/R) Audio Output Connectors

• Combo 1/4’’ / XLR Combo/Microphone Input Jack

• XLR Audio Output Jacks

• Front Panel Button Control Center

• Independent Input Source Selectable

• Bass, Treble, Mid, Balance, Master Volume Adjustable

• Headphone Jack, 3.5mm



Bluetooth Connectivity:

• Built-in Wireless Music Streaming Receiver

• Compatible with All of Your Favorite Bluetooth Devices

• (iPhone, Androids, Smartphones, iPad, Tablets, etc.)

• Bluetooth Version: 2.1

• Bluetooth Network Name: BT

• Wireless Range: 25’+ ft.



What's in the Box:

• Remote Control

• FM Antenna

• Detachable Hardware Rack Mounts

• Power Cable



Technical Specs:

• Rated Power input: 7W

• Input currency: 30mA

• Max power consumption: 15W

• Construction Material: Metal, Aluminum Alloy Panel

• Frequency response: 20-20KHz, +/-2dB

• S/N Ratio: >85dB

• T.H.D.: <1.0%

• Input sensitivity: 200mV (Max Output: 6000mV)

• Battery Operated Remote Control, Requires x ‘CR-2032’ Battery (Included)

• Maximum USB Flash & SD Memory Card Support Size: 32GB

• Digital Media File Support: MP3, WAV

• Power Cable Length: 4.5’ ft.

• Power: 120/240V, Switchable

• Dimensions (L x W x H): 19.0’’ x 4.7’’ x 1.7’’ -inches

• Sold as: 1

• Weight: 4.61 lbs.

• RACK MOUNT COMPATIBLE: Pyle pro audio pre-amplifier has FM radio tuning and unique recording mode that saves audio via USB/SD port. Also, pack with detachable hardware rack mounts for quick and easy assembly
• 2. 1 BLUETOOTH VERSION: Built-in Bluetooth for wireless music streaming receiver that ranges up to 25’+ ft with digital LCD display. It works with all of today’s latest devices such as iPhone, android, smartphone, iPad, tablets, computer and the likes
• AUX INPUT AND OUTPUT: This receiver/preamp also features two sets of RCA inputs, RCA preamp out, 2 Mono RCA's for subwoofer output, and Bluetooth that wirelessly connects to your iPod and MP3 player. Also, an FM antenna for better signal reception
• FRONT CONTROL CENTER: The front panel button control center consists of a power switch, independent input source selectable, bass, treble, mid, balance and master volume adjustment. Also, pack with headphone jack, USB flash and SD memory card readers
• REMOTE CONTROL: A simple and user-friendly remote control is included with the PPRE70BT, providing all the functionality you need from switching input sources. And, it will allow you to access all functions of the receiver quickly and efficiently

User questions & answers

Question:	How many watts is this amplifier
Answer:	This is not an amplifier, it is a pre-amplifier which means that you need a separate amplifier in order to drive speakers.
Question:	The description says two (02) mono rca outputs for subwoofers. where are they
Answer:	You're right that the description says that there are 2 mono outputs for subwoofers but I think that is an error. The picture that there is of the back of the unit is correct, as is the labeling that accompanies the picture.
Question:	can you use rca in and bluetooth out
Answer:	No. The Bluetooth feature is only for receiving from a Bluetooth device as a source.
Question:	Can someone confirm that the remote control can in fact control the master volume on the preamp unit
Answer:	Neither of the other two answers are correct! Here’s the deal. This device has an analog knob with aux 1, aux 2, aux 3, and another multi-function input that includes the radio, bluetooth, and the media card stuff. The volume only works on some of the inputs. Bluetooth, radio, and the media card are routed through the digital, remote controllable volume control. The switch between Aux 1, aux 2, aux 3, and the multi-function input is routed through the master analog volume control, which is controlled by an analog knob that is not remote controllable. I had hoped that this device would offer remote control of the analog RCA inputs, but it does not.

Product features

Pyle Pro Rack Mount Studio Pre-Amplifier

Pyle's Stereo is the perfect solution for all of your audio needs. Using the latest sound amplification technology, this is designed to deliver crisp stereo sounds from a wide range of connected music sources. This pro digital rack-mount preamplifier features FM radio and Bluetooth connectivity. Unique recording mode that saves audio via USB/SD Port.

About Pyle

Pyle has been in business for over 35 years, and their manufacturing experience and expertise is easy to see - and hear.

Product description

This electronic preamplifier stands up to the test and will provide you with serious sound performance. The PP444 is perfect for bringing your studio equipment's phono-level output to a more suitable line-level output. It'll take your audio signal, amplify its strength and prepare it for further processing by your receiver or amplifier. Preamps technically provide voltage gain to your desired equipment and are key to assisting the signal source, whether it's a turntable, musical instrument or microphone. The ultra-low noise audio conditioning circuitry allows the preamp to boost audio to levels that are more manageable for various types of audio equipment. You'll find it easier to adjust the recording level volumes of different sources from microphones and instruments alike. You should position your preamp close to the source to reduce unwanted noise and interference. Preamps can sometimes come built into the stereo equipment, but if that's not the case, the PP444 is an easy install, wise choice and great addition to any musician or producer. Take your sounds and audio production skills to the next level with the PP444 Preamplifier. Features: Converts Phono Signals to Line Level Signals State-of-the-Art Circuitry Accommodates Magnetic Pickups Ultra-Low Noise Operation Improves Sound Performance Connects to Turntables and Other Studio Equipment Input Sensitivity: 3mV at 50K Ohms (Phono) Dedicated RCA and 1/4" Output Connectors Output: 2V max (P-P) at 10K Ohms DC 12-Volt Power Adapter Included Frequency Response: 20 Hz ~ 20 KHz ±2dB S/N Ratio (A-WTD): 70 dB - Output Level: 2V THD: 0.08% @ 1KHz and 3mV Input | S/N Ratio: 70dB Input Sensitivity/Impedance/Phono 3 mV/50K Ohms Load Impedance: 10K Ohms - Reference Voltage: 1V d Dimensions (W x H x D): 3.54" x 2.13" x 1.02" Sold as: Unit Weight: 0.85 lbs.

From the Manufacturer

&

	PP444	PP555	PP999	PHE300	PHE400
	Turntable / Phono Pre-Amplifiers			Noise / Hum Eliminators
Jacks	RCA & 1/4''	RCA & 1/4''	RCA	1/4'' TRS	1/4'' TRS & XLR
12V DC Adaptor	✔	✔	✔

• CONVERTS PHONO SIGNALS: A turntable preamp that converts phono signals to Line Level Signals This state-of-the-art circuitry phono preamp can accommodate magnetic pickups with an input sensitivity of 3mV at 50K Ohms
• LOW NOISE OPERATION: Offers outstanding performance with it’s Low-Noise Audio Operational Amplifiers The output is 2V max (P-P) at 10K Ohms It’s better to position the preamp close to the source to reduce unwanted noise and interference
• CONNECTS TO TURNTABLES: Connect any turntable to modern sound equipment without specialized phono input for amplifying music For the receiver, this can be connected to speakers, computers, laptops and more
• SIMPLE PLUG & PLAY: This mini preamp has stereo RCA inputs and stereo RCA outputs Connect the turntable to the RCA inputs and ground Then, connect the amplifier receiver to the RCA outputs
• 1 YEAR WARRANTY: We guarantee this electric phono preamplifier with both a 30 day no hassle money back return policy and a 1 year manufacturer’s guarantee

User questions & answers

Question:	Does this thing have an/off switch or do you need to plug/unplug everytime you use it
Answer:	no switch. You can plug/unplug, I leave it plugged in all the time.
Question:	Unit works fine for awhile and then starts outputting static, even with no input connected. I've tried it with several amps with the same results
Answer:	Most likely people who are having noise problems it is because of ground loop isolation problem. If you have a ground loop isolation problem grounding the preamp box is unlikely to help. Without getting technical, what you want to buy is a ground loop isolator or a humm eliminator; both the ground loop isolator and humm eliminator tackles the cause of the noise at the fundamental source of the problem, depending on your audio setup, one maybe easier to use than the other. To use the ground loop isolator or the humm eliminator they generally come with instructions, or you can google this topic. If the noise in your audio system isn't fixed by using this solution the first time, try putting the ground loop isolator and humm eliminator at various points in your audio system. Also you can talk to audio people and get advice about how to fix ground loop problems from people who setup big audio systems, for concerts and such; if you talk to the average electronic garage shop audio enthusiast you are likely to get bad advice, i.e., meaningless explanations. Also caution must be used when Googling this topic, much of the discussion, advice and explanation on this topic is bogus, you can get a general correct feel of this topic if you read a number of explanations. Also one more thing that can cause a "popping noise" is that you have too much gain, this is a phono amp and the gain is huge, it takes a 3mV and makes it 2Vp-p this is a gain of around 100 to 200, if you gain up the audio signal too much then the signal out of your amplifier runs out of head room and clips, this can cause a popping sound, essentially you have too much gain. If this is occurring you need to either buy a preamp with less gain or attenuate the signal before it gets to the preamp. If this is a problem, too much gain, you can buy preamps with gain control.
Question:	My turntable has very quiet output. Will this device help boost the volume
Answer:	Yes, indeed. If your need was like mine (no built-in pre-amp on the turntable and no specifically dedicated phono input on your amplifier) you will find this unit to be the perfect solution to needed amplification of the turntable's output. Don't forget to hook up the ground wire as directed or you may wind up putting unwanted noise into the audio.
Question:	My amp DOES have a Phono Input, but my cartridges are low output. Can I use this to boost the signal using the Phono Input to reduce audible hiss
Answer:	No, you can't. This is a phono preamp with RIAA playback equalization that amplifies the signal about 100 times, so it essentially does what your built-in phono preamp does. The output signal from the separate preamp is equalized to a nominally "flat" frequency response and the amplified signal level will overload and probably damage your built-in phono preamp. Plug it into any other stereo line input on your system (AUX, CD, DVD, TAPE, VCR, etc.), but NOT the PHONO input! If you need higher signal gain, maybe look at phono preamps from ART or TCC that have output level controls. If you use moving-coil (MC) cartridges, you need a preamp specifically designed for them...they require at least 55 dB (over 500 times) signal gain vs. about 40 dB (100 times) for moving-magnet (MM) cartridges. Noise becomes a critical issue with MC cartridges because of their extremely low signal output, so good-quality cables and good turntable grounding are essential.

Product features

Pyle Phono Turntable Preamp Mini Electronic Audio Stereo Phonograph Preamplifier with RCA Input, RCA Output & Low Noise Operation Powered by 12 Volt DC Adapter

• Converts Phono Signals to Line Level Signals
• State-of-the-Art Circuitry Accommodates Magnetic Pickups
• Ultra-Low Noise Operation Improves Sound Performance
• Connects to Turntables and Other Studio Equipment
• Input Sensitivity: 3mV at 50K Ohms (Phono)
• Dedicated RCA and 1/4'' Output Connectors
• Output: 2V max (P-P) at 10K Ohms

• DC 12-Volt Power Adapter Included
• Frequency Response: 20 Hz ~ 20 KHz ±2dB
• S/N Ratio (A-WTD): 70 dB - Output Level: 2V
• Input Sensitivity/Impedance/Phono 3 mV / 50K Ohms
• Load Impedance: 10K Ohms - Reference Voltage: 1V d
• Dimensions (W x H x D): 3.54" x 2.13" x 1.02"

Product description

PylePro Model : PP999

Compact Ultra-Low Noise Phono Turntable

Compact Ultra-Low Noise Phono Turntable Preamp with 12-Volt Adaptor - Preamplifier

Converts Phono Signals to Line Level Signals

12-Volt DC 110V Adaptor Included

Dedicated RCA Connectors

Output Level: 2V

Reference Voltage: 1V

Load Impedance: 10K Ohms

S/N Ratio (with A-WTD): 70 dB

T.H.D. : 0.08 for 1 KHz 3 mV Input

Frequency Response:20 Hz ~ 20 KHz ±2dB

Input Sensitivity / Impedance / Phono - 3 mV / 50K Ohms

Dimensions (W x H x D):3.54'' x 2.13'' x 1.02''

Weight : 0.88 Lbs

This electronic preamplifier stands up to the test and will provide you with serious sound performance. The PP999 is perfect for bringing your studio equipment's phono-level output to a more suitable and manageable line-level output. It'll take your audio signal, amplify its strength and prepare it for further processing by your receiver or amplifier. Preamps technically provide voltage gain to your desired equipment and are key to assisting the signal source. The ultra-low noise audio conditioning circuitry allows the preamp to boost audio to levels that are more manageable for various types of audio equipment. You'll find it easier to adjust the recording level volumes of different sources and instruments alike. You should position your preamp close to the source to reduce unwanted noise and interference. Preamps can sometimes come built into the stereo equipment, but if that's not the case, the PP999 is an easy install, wise choice and great addition to any musician or producer. Take your sounds and audio production skills to the next level with the PP999 Preamplifier.

From the Manufacturer

&

	PP444	PP555	PP999	PHE300	PHE400
	Turntable / Phono Pre-Amplifiers			Noise / Hum Eliminators
Jacks	RCA & 1/4''	RCA & 1/4''	RCA	1/4'' TRS	1/4'' TRS & XLR
12V DC Adaptor	✔	✔	✔

• CONVERTS PHONO SIGNALS: A turntable preamp that converts phono signals to Line Level Signals. This state-of-the-art circuitry phono preamp can accommodate magnetic pickups with an input sensitivity of 3mV at 50K Ohms
• LOW NOISE OPERATION: Offers outstanding performance with it’s Low-Noise Audio Operational Amplifiers. The output is 2V max (P-P) at 10K Ohms. It’s better to position the preamp close to the source to reduce unwanted noise and interference
• CONNECTS TO TURNTABLES: Connect any turntable to modern sound equipment without specialized phono input for amplifying music. For the receiver, this can be connected to speakers, computers, laptops and more
• SIMPLE PLUG & PLAY: This mini preamp has stereo RCA inputs and stereo RCA outputs. Connect the turntable to the RCA inputs and ground. Then, connect the amplifier receiver to the RCA outputs

User questions & answers

Question:	If I have a record player without a Preamp, will this help me with hooking it up to a Sonos
Answer:	You can hook it up to anything with a red and white connection. Or if you get the rca to 3.5mm jack then you can hook it up to anything with an input slot. I used this on my realistic lab 440 which doesn't have a preamp. Once I connected the ground from my turntable into the ground slot on this amp, my music sounded loud and clear.
Question:	mp
Answer:	Turntables (with typical magnetic cartridges) have very low signal output (a few thousandths of a volt). Records have the bass reduced to provide enough room on the surface for the recorded grooves, and the treble boosted to reduce the surface noise level when played back. A phono preamplifier performs two jobs: - It boosts the small signal from the turntable by about 50 to 100 times (producing a "line level" signal) so it can be used by typical receivers or amplifiers.- It also boosts the bass and reduces the treble according to an industry standard (the RIAA equalization curve) to restore the signal from the record to its original frequency response.The Pyle PP999 is just an inexpensive phono preamp, nothing special. Phono preamps can range from $20 on up to whatever you're willing to pay for ultra-high quality. Some manufacturers make "USB" phono preamps that have A/D (analog-to-digital) converters built in and connect to a computer's USB port. Most of these provide "CD quality" conversion (16-bits at 44kHz or 48kHz). These may be adequate for digitizing your vinyl, but many computer sound systems can provide up to 24-bit, 192 kHz conversion depending on the software you use (much higher quality), by connecting the preamp output to the computer's line input. Don't just convert directly to MP3 files...you'll lose too much detail compared to the original vinyl sound. It takes almost no time to make an MP3 copy of a high bit-rate WAV or FLAC (lossless) file, but it'll take you an hour to make ANY digital copy of an LP, so do it the best you can the first time!
Question:	So this is a stupid question, I plug my RCA wires coming from my turntable into the Amp. But where do I plug the speaker wires into on the Amp
Answer:	TurnTable==>PreAmp==>Receiver/Amplifier==>SpeakersThe 'Pyle PP999' is the "Preamp". The Turntable is plugged into the PP999 INPUT and the PP999 OUTPUT plugs directly into any (non Phono) INPUT on the receiver. Your Receiver allows you to switch between different music-sources, contains the primary-amplifier and distributes the final sound out to the speakers(and subwoofer). The Receiver should have multiple inputs for receiving signals from eg. CD, Tape, VCR, etc. In my experience those labels are for convenience and interchangeable with the exception of a "Phono" input. NOTE: If the receiver has a "Phono" input then there's a built-in preamp. If your using an external preamp (Pyle PP999) do NOT plug it into the Receiver's 'Phono' input, it could cause damage. I plug the preamp for the turntable into the Receiver's 'VCR' or 'TV' inputs.
Question:	I have the Pyle turntable and Pyle stereo but they don't work together--VERY low sound--so is this the missing piece
Answer:	Turntables (with typical magnetic cartridges) have very low signal output (a few thousandths of a volt). Records have the bass reduced to provide enough room on the surface for the recorded grooves, and the treble boosted to reduce the surface noise level when played back. Most modern receivers DO NOT have the right inputs to deal with this signal (no "phono" input). A phono preamplifier performs two jobs: - It boosts the small signal from the turntable by about 50 to 100 times (producing a "line level" signal) so it can be used by typical receivers or amplifiers.- It also boosts the bass and reduces the treble according to an industry standard (the RIAA equalization curve) to restore the signal from the record to its original frequency response.The Pyle PP999 is just an inexpensive phono preamp, nothing special. Phono preamps can range from $20 on up to whatever you're willing to pay for ultra-high quality. Some manufacturers make "USB" phono preamps that have A/D (analog-to-digital) converters built in and connect to a computer's USB port. Most of these provide "CD quality" conversion (16-bits at 44kHz or 48kHz). These may be adequate for digitizing your vinyl, but many computer sound systems can provide up to 24-bit, 192 kHz conversion depending on the software you use (much higher quality), by connecting the preamp output to the computer's line input. Don't just convert directly to MP3 files...you'll lose too much detail compared to the original vinyl sound. It takes almost no time to make an MP3 copy of a WAV or FLAC (lossless) file, but it'll take you an hour to make ANY digital copy of an LP, so do it the best you can the first time!

Product description

Description of PPA50: Top quality low noise preamp: The main job of a pre-amp is to control the signal going to your amp or powered speakers. They are the first part of your signal and a good pre-amp is essential to having great sound quality. Having a separate pre-amp that specializes in that one job will give you better sound quality than an all in one receiver or integrated amplifier. Inputs and Outputs: What makes our model different from some of the standard ones on the market is that we carefully chose the inputs and outputs. We have RCA aux inputs that will support any audio device. We also have a Phono RCA to support turntables. There are ¼” inputs that can be run in stereo for any pro audio devices. There is also a front combo jack with selectable mic/line. The mic preamp is extremely low noise. Recording interface: Yea, we did it. We added a USB computer interface! Yes, this will work with any of your favorite DAW’s such as pro tools or Ableton live. You can record the final mix into one stereo channel in pro tools or any other DAW. Anything being played through the pre-amp will be recorded including the microphone inputs, as well as any source you are playing. It will be summed to one stereo channel in your DAW. You can also use Ableton live or any other software to play music as an input device on the preamp. The interface is 2-way and you can use it as an input playback device or as an output recording device. Bluetooth and USB playback: We wanted to make this product extremely versatile, so we added Bluetooth audio playback. This is perfect for home audio use as well as for some pro audio applications in between sets etc. There is also USB playback so you can play back audio saved on a thumb drive. Amazing controls: There is a high quality 3 band EQ so you can adjust and fine tune your sound. There are bass, mid, and treble controls. Also, we added a low-cut crossover which is great if you will be using a subwoofer.

• Features of PPA50: Rockville PPA50 Preamp Pro 1U Rack Pre-Amplifier w/Bluetooth/USB/PC Interface, Top of the line professional preamp with low noise and high sound quality, Built in reliable Bluetooth audio playback with long range, Built in USB/computer interface allows you to record the master output to your DAW or to play songs from your favorite software on your computer, Built in USB MP3 player, RCA aux inputs, RCA Phono Input, XLR and ¼” Combo jack front mic/line input.
• ¼” Inputs (mono or stereo), XLR outputs (stereo or mono), 1U rack mount size, Built-in 3 band Equalizer (bass, mid, treble), Left / Right balance adjustment, Mono/Stereo selectable, Mute, Low cut crossover filter, Headphone output for listening or monitoring, Loudness compensation circuit which at low-to-medium volume boosts the bass and treble response, 100-240V worldwide voltage power adaptor.
• Specifications of PPA50: Impedance: Mic: 1mV / 3 Kohms, Phono: 3mV / 47 Kohms, Pre-Output: max. 11V / 1 Kohms, Total Harmonic Distortation: Mic: less than 0. 02%, Phono: less than 0. 04%, RCA Aux: less than 0. 01%.
• Signal to Noise Ratio: Mic: more than 70 dB, Phono: more than 90 dB, RCA Aux: more than 100 dB, General: Product weight: 4. 43 lbs, Product dimensions: 18. 89" x 6. 49" x 1. 73".

User questions & answers

Question:	Is the hissing noise i read about in reviews a common experience for those who bought the ppa
Answer:	While this is a "budget" preamp more geared to sound reinforcement than high-end Hi-Fi, it does a fine job in most categories as long as you feed it an adequate level of signal input. I have not used the phono section so I cannot speak to that. However, the line level inputs, mic input, mp3 Bluetooth and mp3 USB Thumb Drive all work well without a distracting noise level. If you try to use a low-level input signal that causes you to turn the appropriate gain control or Master Volume control up full then you can expect a modest amount of hiss that will be heard during low or silent passages. For example, don't try using a low-output "ribbon" microphone and expect good performance without a separate microphone preamp ahead of this unit. Over all, I find these preamps quite usable. I own 4 of these units and they all have worked well and identically for my applications.
Question:	Bluetooth
Answer:	No, and I don't own this anymore because it arrived broken, bent and was junk. Returned it.
Question:	Can this be used with a Rockville tube amplifier
Answer:	I don't see why not!
Question:	Hows the Bluetooth on it? Does it have bluetooth
Answer:	It does have Bluetooth. Decent product however more for home studio use. I’d gave it a B-

Product features

Rockville PPA50 Preamp Pro 1U Pre-Amplifier w/Bluetooth/USB/Computer Interface

Description:

Top quality low noise preamp The main job of a pre-amp is to control the signal going to your amp or powered speakers. They are the first part of your signal and a good pre-amp is essential to having great sound quality. Having a separate pre-amp that specializes in that one job will give you better sound quality than an all in one receiver or integrated amplifier.

Inputs and Outputs What makes our model different from some of the standard ones on the market is that we carefully chose the inputs and outputs. We have RCA aux inputs that will support any audio device. We also have a Phono RCA to support turntables. There are ¼” inputs that can be run in stereo for any pro audio devices. There is also a front combo jack with selectable mic/line. The mic preamp is extremely low noise.

Recording interface Yea, we did it. We added a USB computer interface! Yes, this will work with any of your favorite DAW’s such as pro tools or Ableton live. You can record the final mix into one stereo channel in pro tools or any other DAW. Anything being played through the pre-amp will be recorded including the microphone inputs, as well as any source you are playing. It will be summed to one stereo channel in your DAW. You can also use Ableton live or any other software to play music as an input device on the preamp. The interface is 2-way and you can use it as an input playback device or as an output recording device.

Bluetooth and USB playback We wanted to make this product extremely versatile, so we added Bluetooth audio playback. This is perfect for home audio use as well as for some pro audio applications in between sets etc. There is also USB playback so you can play back audio saved on a thumb drive.

Amazing controls There is a high quality 3 band EQ so you can adjust and fine tune your sound. There are bass, mid, and treble controls. Also,we added a low-cut crossover which is great if you will be using a subwoofer so that you can cut some lows out of your main speakers. The mic/line input on the front has its own volume control and can be used at the same time as any of the other sources like Bluetooth or RCA.

• 🍎 NOTE: This is a preamplifier, not a power amplifier or phono preamp, can't be used for turntables or passive speakers.
• RCA input to the computer, CD, phone, iPod and other player and RCA output to the digital amplifiers, active multimedia audio devices for lossless audio(The RCA cables not included).
• Small compact design, with optimal integrated circuit to get powerful, dynamic and sweet sound. Tubes can be replaced by 6K4,6AK5,EF95, 5654,403B tubes.
• This pre-amp improves everything detail, transparency, immediacy, richness, tone associated with your music.
• Built-in Switch impact protection circuit and overheat protection circuit, long life span of this unit. All aluminum alloy shell and come with a 18-month manufacturer's warranty.

User questions & answers

Question:	Can this preamp connect to my active speakers? or just connnect to power amplifier
Answer:	Hi, This is a stereo preamplifier, you can connect it to the active speakers or power amplifier than to passive speakers.
Question:	I have this hooked up to bookshelf speakers, sounds great, would i hear a noticable difference hooking it to a subwoofer
Answer:	I currently use the Pre-Amp with a powered subwoofer amp, it works just fine. The P1 has frequency response down to 20hz, so adding a subwoofer may be worth your while.
Question:	Can i hook this up to a 2 channel receiver? i have a pioneer sx-10ae
Answer:	Yes you can if your receiver has output/input jacks for the Fosi to be in a "loop". If you do not have input/output jacks then you would be relegated to installing the Fosi to cd player or turntable or whatever component you are trying to acquire a bit of tube sound. I use mine to "soften "a bright metal tweeter in my speakers. Since I have separate components it was easy to install in my case. Also check to see if your receiver has "preamp" in/out jacks. This would also allow you to install the Fosi to have a effect on your receiver as well as any other components you have connected to it. A bit of research on your part will be required.
Question:	Is there a recommended replacement tube
Answer:	I replaced the stock ones with the Riverstone Audio 7-Pin GE JAN 5654W (https://www.amazon.com/gp/product/B01BFJDTW0/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1). They are very nice tubes but do need about 20-25 hours of solid burn-in before they start to "warm up the sound" in my opinion.

Product features

6K4 Tube Preamplifier

• Power Adapter Output: 12V/1.5A
• Product Adapter Input Voltage Range: AC 110V - 240V
• SNR ≥ 98dB
• THD ≤ 0.1%
• Treble adjustment range: ±6dB
• Bass adjustment range: ±10dB
• Input Mode: RCA
• Frequency Response: 20HZ -20KHZ((±3dB)

Tube preamp with BASS and TREBLE control

Satisfies your need for more sound quality! Great Warm Smooth Sounding!

Simple, thoughtful design

Fosi Audio P1 is easy to connect to your power amplifier or active(powered) speakers with no software to install or settings to change.

Adopt 2pcs 6K4 vacuum tubes

Powerful, dynamic, and sweet TUBE SOUND! Applicable vacuum tube model:6J1,6AK5,EF95, 5654,403B, etc.

Product description

Rockville PPA20 Rack Mount Pre-Amplifier

1U Rack Size

1/4" microphone input

RCA PHONO / AUX1 / AUX2 / AUX3 / AUX4 / AUX5 inputs

1/4" headphone output

RCA REC / LINE outputs

XLR master output ( left, right )

Headphone volume & Microphone volume controls

3 band EQ (Treble / Mid / Bass)

Master volume

L / R balance

Input source switch

Mono / Stereo switch

Mute

Low cut crossover control allows you to cut off certain frequencies which comes in handy when using turntables, subs, and other gear. This function will allow you to play your music louder, with lower distortion and make your speakers last longer

Treble / Bass control

Loudness compensation circuit which at low-to-medium volume boosts the bass and treble response

Tape Monitor

Ground lift switch

Unit dimensions: 18.89” x 6.49” x 1.73” inches

Unit weight: 4.43 lbs

Shipping dimensions: 20.47” x 8.46” x 4.33” inches

Shipping weight: 5.73 lbs

• Rockville PPA20 Rack Mount Pre-Amplifier. 1U Rack Size. 1/4" microphone input. RCA PHONO / AUX1 / AUX2 / AUX3 / AUX4 / AUX5 inputs. 1/4" headphone output. RCA REC / LINE outputs. XLR master output ( left, right ). Headphone volume & Microphone volume controls. 3 band EQ (Treble / Mid / Bass). Master volume. L / R balance. Input source switch. Mono / Stereo switch. Mute
• Low Cut Switch allows you to cut off certain frequencies which comes in handy when using turntables, subs, and other gear. This function will allow you to play your music louder, with lower distortion and make your speakers last longer. Treble / Bass control. Loudness compensation circuit which at low-to-medium volume boosts the bass and treble response. Tape Monitor . Ground lift switch
• Unit dimensions: 18.89” x 6.49” x 1.73” inches. Unit weight: 4.43 lbs. Shipping dimensions: 20.47” x 8.46” x 4.33” inches. Shipping weight: 5.73 lbs
• Inputs Sensitivity/Impedance. Mic: 1mV / 3 Kohms. Phono: 3mV / 47 Kohms. Tape, Tuner, CD, Aux: 150mV / 22 Kohms. Output/Impedance. Tape Rec: 150mV / 3 Kohms. Pre Output: max. 11V / 1 Kohms. Total Harmonic Distortation. Mic: less than 0.02%. Phono: less than 0.04%. Tape, Tuner, CD, Aux: less than 0.01%. Signal To Noise Ration. Mic: more than 70 dB. Phono: more than 90 dB. Tape, Tuner, CD, Aux: more than 100 dB
• Frequency Response: 5Hz . 30kHz +0, -3 dB. Bass: 12dB at 100Hz. Midrange: 9dB at 1 Hz. Treble: 12dB at 10kHz. Loudness: 9/0/+9dB at 100/1k/10kHz. Mute: 20dB. Power Consumption: 15W

User questions & answers

Question:	Is the phono input capacitance 100pf or 200pf?　the seller should answer this
Answer:	I'm not the seller. However, it does need a preamp to work with a magnetic phono cartridge.
Question:	Do i i need a better eq
Answer:	Not necessarily. If you’re more recording inclined, maybe. The dynamic range should suffice for most everyday listeners.
Question:	Can i take a regular 3.5 mm aux cord and plug it into the input and take a 3.5 mm aux cord and plug it into the output for my headphones
Answer:	Don't see why not.
Question:	My speakers are speakon so how do i use this amp to run my speakers to run my speakers as a output
Answer:	You need an amp with speakon outputs like the beringer kvm 750. That amp is 750 watt and two channels, you can get it from Amazon for 150.00 . It's a good solid amp with speakon outputs for your speakers.

Product features

Rockville PPA20 Preamp Professional 1U Rack Mount Pre-Amplifier w/Crossover+EQ

General:

• Frequency Response: 5Hz . 30kHz +0, -3 dB
• Bass: 12dB at 100Hz
• Midrange: 9dB at 1 Hz
• Treble: 12dB at 10kHz
• Loudness: 9/0/+9dB at 100/1k/10kHz
• Mute: 20dB
• Power Consumption: 15W

Product description

MCM CUSTOM AUDIO 50-14820 STEREO LINE LEVEL AMPLIFIER ADJUSTABLE 0 - 15DB GAIN

• Price For: EachOrder Unit: Each 1

User questions & answers

Question:	I want to boost my ipod signal to the aux in of a car stereo. will this work for that? it has rca female input jacks on the back of the stereo
Answer:	Yes. Just keep in mind that this booster requires a power source in addition to the input and output cables. The power supply (fits in an ac outlet) is included with the device.
Question:	Can it drive 4 rock speakers from a rheostat connected to my home theater system
Answer:	No
Question:	Hi there, I have svs pb 2000 subwoofer connected to yamaha receiver and the output is way too low, i can barely hear that the sub is there.how do i co
Answer:	Its odd that your SVS pb 2000 (500WRMS 1000w peak) is too low when connected to the output of a yamaha receiver. I have exact same sub connected to line out output of a receiver (all line level outputs are about the same on all receivers) except some are a function of the receiver's volume and others are fixed volume. Either way, when my SVS pb 2000 volume is slightly over half its loud as hell, house shaking. Are you sure you have everything set/connected correctly ? Does your yamaha reciever have a dedicated bass out jack ? Something doesnt seem right. Try connecting to some other line out output on yamaha. Try disconnecting or shut off your main speakers, turn receiver volume to half way and see how loud sub really is. Does your music actually have subwoofer frequency content?? Try some modern rap or EDM music with known loud bass content. Just curious, are your speakers too loud at halfway? Anyway this little amp is extremely easy to connect. Just connect stereo RCA cable out from yamaha to input of this little amp, then connect another stereo RCA cable from output of little amp to subwoofer input.
Question:	How is it powered
Answer:	It is powered by a power adapter (included). It was a good match for my needs.

Product description

Introduction

Douk Audio L1 is a stereo amplifier with built-in voltage boost and amplification circuits, designed to boost the output of virtually any line level audio source (such as TV, video games, MP3 players, ipod, phone, tablet etc.) to max 20dB. L1 features its wide gain range, wide frequency response, excellent S/R and HiFi sound, to bump the output level of the audio devices which are with an inherently low level output so as to match other sources, or to allow the use of a longer cable run than normal between components.



Warm Tips

1. 3.5mm AUX input with priority, please make sure AUX cable has been disconnected if you want 5-DIN or stereo RCA input.

2. 5-DIN and stereo RCA output can work at the same time.

3. Equipped with USB to DC cable, NOT include power adapter, can use phone charger/power bank/computer to power it.



Parameters

Audio input: 3.5mm AUX / Stereo RCA / 5-DIN

Audio output: Stereo RCA / 5-DIN

Gain: 20dB (Adjustable)

Frequency response: 20Hz-20KHz ( ± 0.5dB)

THD: 0.06% Max

S/N ratio: >80dB

Input sensitivity: 150mW/50KHz at 1KHz

Max output amplitude: ±12.5V

Input voltage: DC 5-24V

Working voltage of amplification part: DC 26V

Dimensions(W*D*H): 87*63*48mm / 3.43*2.48*1.89in

Package dimensions(W*D*H): 150*90*110mm / 5.91*3.54*4.33in

Net weight: 155g / 0.34lb

Package weight: 400g / 0.88lb



Packing List

1*L1 Stereo Line Level Booster

1*USB to DC Cable

1*3.5mm to RCA Cable

1*2:2 RCA Cable

• Mutiple input/output interfaces: with 3.5mm AUX/stereo RCA/5-DIN inputs and stereo RCA/5-DIN outputs, can be compatible with most low-volume audio sources such as ipod, ipad, phone, TV, MP3 player, potable CD player, computer, video game etc., and boost their output to the level needed to drive amplifier or speakers.
• With built-in amplification and voltage boost circuit: adjustable gain to match better with different audio sources, support DC 5-24V wide input voltage that can share the power supply of amplifiers, while L1 can always work at a high voltage of 26V to provide ±12.5V high output amplitude and max 20dB high gain.
• Unique design and HiFi clear sound: double-side PCB design, NE5532P op amp with pluggable socket design, convenient to change other op amps to enjoy different sound and bring much DIY fun for audiophiles. High-qaulity sealed potentiometer, with wide frequency bandwidth and excellent dynamic response, the sound is smooth and natural, warm and delicate with ultra-low distortion.
• Mini size with exquisite appearance, compact and all-metal design for durability and shielding the electronics from electromagnetic interference with noise rejection. Perfect design in size and function, suitable for many scenarios to increase the output level, such as home stereo system, mixer or speaker setup, karaoke, audio recording, party, live stage event etc.

• ♪ HIGH QUALITY MATERIALS—The chassis of the preamplifier is made of a solid aluminum alloy material, and uses accurate and stable integrated circuits and high-quality components to eliminate low-frequency noise and ensure clear sound quality; The material of its PCB board is made of FR-4 insulation board and black immersion gold Craft, which has the characteristics of stable signal, high temperature resistance, long service life, and not easy to be oxidized.
• ♪ EXQUISITE APPEARANCE DESIGN—FX AUDIO pre-amplifier has a mini exquisite appearance and light weight, easy to carry around, its brushed texture surface and high-quality tube combine to appear more fashionable ,elegant and Classical.
• ♪ SEPARATE CONTROL OF BASS&TREBLE—The vacuum tube preamplifier can independently adjust the bass and the specific proportion components in high-frequency sound to perfectly achieve HiFi effects. At the same time it can maximize the rendering of an atmosphere like being in a music performance to satisfy your experience of different sound styles in pursuit sound quality.
• ♪ RCA INPUT & OUTPUT—From RCA output ,the preamp can also be directly connected to the audio source and active multimedia audio equipment or indirectly connected to passive audio through the power amplifier(The item includes RCA cable).
• ♪ NOTE—The item just is a tube preamp, not a power amplifier or phono amplifier. Because it is a household circuit design, the home theater tube preamp can not be used in cars, turntables or passive speakers, nor can it directly work for headphones, speakers and can not be used as a phono amplifier.(Only suitable with 12V power cord).Package Include: 1 x tube preamp, 2 x 6K4 tubes,1 x power supply, 1 x RCA cable,1 x user manual, 1 x security card/1 year warranty

Product features

In order to dedicated to serve audiophile and display our cultural concept of "enjoy music,enjoy life", FX AUDIO developed the mini electronic tube preamp.

FX AUDIO tube preamplifier is designed by using aluminum alloy shell, PCB board of black immersion gold craft and gold-plated interface, mainly to enhance the weak voltage signal from the audio source and control the sound quality to achieve the effect of beautifying the sound.

Adopt 6K4 Vacuum Tube Design

The audio preamplifier is designed with two 64K vacuum tube, which can simulate natural sound,that is soft and delicate, dynamic and pleasing, strong and powerful, and very penetrating. FX AUDIO Pre-amplifier is the best choice for the friends who have high pursue with the sound timbre. (The tube can also be replaced according to personal preference).

HiFi Sound Quality

The function of the audio quality control of the audio preamplifier is to control the frequency characteristics of the audio system to achieve high-fidelity sound quality, or to modify and beautify the sound according to the listener's preferences, but also to adjust the sound range to achieve balance Make the resolution of sound more natural and transparent.

Wide Compatibility

FX AUDIO tube preamplifier have a wide compatibility,which input can be connected to various audio source equipment, including mobile phones, computers, CD / DVD, etc. From RCA output ,the preamp can be connected the power amplifiers to use ,also can be connected directly to an active speaker.

Product description

The Best Choice for Active Speakers

More and more audiophiles find that the behavior of normal multimedia speakers cannot meet their demands, and then they choose professional active monitor speakers. However, this kind of speakers usually doesn't have a volume controller, which means a pre-amplifier is needed.

Active monitor speakers are mostly placed on the desk and used for near field listening. So they need to consider the area required for Hi-Fi pre-amplifiers (normally very big). What'more, different pre-amplifiers may differ in their timbres and this is the most bothersome issue.

As an audiophile brand, Nobsound decided to solve this problem and designed this product. Its small size won't take much place and its clean silver color suits for various usage scenarios. There is no amplifying circuit in the device and won't change the timbre, while the amplifier in the active speaker is enough to drive it. With this product, you can enjoy the most original timbre and quality of the speakers and won't be trapped in the selection of pre-amplifiers.

Specifications:

• Dimension: 148 x 48 x 80 (mm)
• Weight: 0.6 (Kg)
• Impedance: 50KΩ
• Input: RCA / XLR (selection switch)
• Output: RCA / XLR (selection switch)

Package:

1 * pre-amplifier

• This product uses the expensive ALPS 09 quadruple fully-balanced potentiometer, NEUTRIK XLR, Pro-Singnal RCA. Nobsound never be stingy in the components and materials of our products.
• This prodcut has a small size, while is still euipped with commonly-used interfaces. There is a selection switch which you can choose the fully-balanced or single-ended audio signal mode, as well as the output or input mode.
• This prodcut has no amplifying circuit and won't change the timbre. You can enjoy the most original sound of your active monitor speakers.
• Its clean black appearance suits for almost every usage scenarios.
• PLEASE NOTE: This is a PASSIVE PREAMPLIFIER. It has NO amplifying circuit.

User questions & answers

Question:	Can i use this between an amp (Topping MX3) and powered speakers to protect the speakers amp
Answer:	No. It would make more sense to use the headphone output and find a splitter to connect it to your powered speakers.
Question:	Does this preamp output +4dBu or -10dbV
Answer:	Hello. This is a fully passive preamp with no amplification function.
Question:	Is the case (including front panel) made of metal
Answer:	Yes, all metal. It is a ver solid unit.
Question:	Is the reason for this box to convert unbalanced rcas to a balanced xlr signal? it’s just for defeating possible unbalanced signal noise
Answer:	I think most people purchase this box for volume control. It has a high quality potentiometer for this purpose. It will convert an RCA input to a balanced, XLR, output. But it would probably be more cost effective, and space saving, to purchase RCA to XLR cables if that’s all you want to do.

• 【Easy to Use】 This mini preamp has stereo RCA inputs and stereo RCA outputs. Connect the turntable to the RCA inputs and ground , and then connect the amplifier receiver to the RCA outputs.
• 【Converts Phono Signals】Turntable preamplifier, which can convert sound signal into line level signal, this advanced circuit sound preamplifier, input sensitivity electromagnetic pickup.
• 【 Low Noise Operation】Offers outstanding performance with it’s Low-Noise Audio Operational Amplifiers. Hooking up the preamp to the turntable and audio device, and then you can enjoy the better sound and less distortion.
• 【DC 5V power supply】This product uses the latest DC 5V power supply mode, so no longer restricts the application scenarios. Note: Please use an external power supply with CE or UL certification, and stay away from the interference source, otherwise it will cause noise and other undesirable interference to the product. (No adapter included)
• 【Double gain】Considering that the signal of the phonograph is relatively weak, our company has added a set of gain adjustments for the input and output, so that the sound volume of the phonograph can be perfectly played. NOTE: This preamplifier must be used together with a power amplifier.

User questions & answers

Question:	Does it have enough power to provide enough adjustable signal to a cassette recorder
Answer:	Definitely no problem!
Question:	Will this work with a sound bar
Answer:	Yes, it will just plug it into the aux port.
Question:	What is the maximum distance I place unit from receiver
Answer:	Hi, it depends on the length of your cable. Generally, it is recommended to not exceed 2 meters.
Question:	It sounds like a power source is not included with the product. Do I have to provide my own power adapter
Answer:	Yes, as stated on the detail page, the power supply and adapter are not included for this Preamplifier. You could use a 5V1A adapter with UL or CE certification for it. And this Preamplifie uses the latest DC 5V power supply mode, you could use an external power supply with CE or UL certification for it. Hope the above helps.

Product features

Nice Sound for Vintage Record Players

The Moukey phono preamp boosts your turntable's phono audio level up to a more speaker/stereo receiver-friendly line level, giving you better volume and increased sound quality. It'll take your audio signal, amplify its strength, and prepare it for further processing by your receiver or amplifier.

Preamps provide voltage gain to your desired equipment and are key to assisting the signal source, whether it's a turntable, musical instrument or microphone.

The ultra-low noise audio conditioning circuitry allows the preamp to boost audio to levels that are more manageable for various types of audio equipment.

It will be more easier to adjust the recording level volumes of different sources from microphones and instruments alike.(NOTE: Position your preamp close to the source to reduce unwanted noise and interference. )

Unique DC 5V Power Supply

This product uses the latest DC 5V power supply mode, so no longer restricts the application scenarios. Note: Please use an external power supply with CE or UL certification, and stay away from the interference source, otherwise it will cause noise and other undesirable interference.

Clear Sounding Audio

The phono preamp creates smooth equalization for balanced, clear audio. Helps limit distortion and for the best quality sound, make sure to securely plug in all cables.

Small Size and Easy to Carry

The compact metal casing is both rugged and space-saving.

Product description

Pyramid Model : PR2500

Stereo Control Pre-Amplifiers

Power On/Off Switch w/LED Indicator

Microphone Input Jack

Microphone Level Control

Bass/Midrange/Treble/Loudness/Balance Control

Master Volume Control

Low Frequency Filter

Stereo/Mono Switch

Tape PLAY and REC Output RCA Jacks

Muting Switch

Input Source Selector

Tuner/CD/Aux/Phono Input RCA Jacks

Tape Monitor Switch

110/220 Voltage Switchable

Rack Mount Design

Dimensions: 19''W x 2.375''H x 8.5''D

• HIGH/LOW FREQUENCY FILTER: Features low-frequency filter to eliminate rumble of turntable/other undesirable low-frequency noise and to minimize distortion from warped record, and high-frequency filter to reduce/eliminate scratch noise of record
• SOURCE SELECTOR: phono pre amp is equipped w/ independent source selectors including tape to playback signal of the connected tape deck, tuner for AM FM tuner signal, CD for CD player, PHONO for turntable, and AUX for other connected devices
• FRONT CONTROL PANEL: The stereo control pre-amplifier has front panel control center w/ ON/OFF switch w/ LED indicator, mic in w/ level control, bass/mid range/treble/loudness/balance/ master volume rotary control to easily balance audio levels
• MICROPHONE JACK: The pre amp is equipped w/ microphone input jack w/ level control in the front panel to easily record vocals. It also has stereo/mono switch to select from stereo or mono input signal and muting switch to reduce level by 20dB
• AC SELECTOR: Slide the AC source selector switch to choose the type of ac source between 110V and 220V. It also has a fuse holder that contains an AC primary fuse. Measures 19"W x 2.375"H x 8.5"D and has a rack mount design for easy installation

User questions & answers

Question:	I have a powered mixer (2 speaker connected), can use this preamp to improve quality? How is connected to mixer
Answer:	No. The holster will not fit with anything attached to the front rail.
Question:	Hi all! How many output source does this item have? I ask because there is not picture from backside
Answer:	This one is black
Question:	Is it rackmountable? What is the real dimensions? How much u spaces it takes when it is mounted in a rack? Thanks for answers
Answer:	Holster come with a paddle
Question:	Does this one work as a pre-amp for my Bose 901 series vi speakers? thanks
Answer:	Yes....I just purchased a Glock 17 Gen 5 n this holster fits...hope that helps

• This Bluetooth 5.0 Vacuum tube preamp,With Bass and treble,Sound quanlity really good,Let you enjoy sweet and warm sound quality.(Note:Cannot be used on a record player and phonographs)
• AUX / Bluetooth Audio input Manual switch mode, See the product description for more details,With DC12V/1A power supply(Do not use a power supply exceeding 12V)
• Using the classical tube 6j1 design for easy replacement,Designed so the tube can be replaced, soft voice.Adopt the Dual run amplifier chip NE5532P power conversion module
• Build quality is surprisingly solid,Nice touch!The power circuit is completely separate from the audio circuit, Minimizing interference for clear sound
• This AIYIMA TUBE A3 PRO is a preamplifier. It is not an audio amplifier. It needs to be connected to an active speaker or a rear amplifier & Passive speaker.Any technical problem,pls contact us,We will solve it for you until you are satisfied

User questions & answers

Question:	I bought to use with my computer audio into stereo amplifier and passive speakers. is there a diagram on how to connect
Answer:	Hi, you can use the input port at the back of the unit for your mixer. You may check other details of the unit by visiting our website pyleaudio.com. Type the model number on the search box PR2500 for more details. Thank you.
Question:	What is the output impedance
Answer:	According to Pyramid website there are two different output sources; Tape PLAY and REC Output RCA Jacks.More Features:Power On/Off Switch w/LED IndicatorMicrophone Input JackMicrophone Level ControlBass/Midrange/Treble/Loudness/Balance ControlMaster Volume ControlLow Frequency FilterStereo/Mono SwitchTape PLAY and REC Output RCA JacksMuting SwitchInput Source SelectorTuner/CD/Aux/Phono Input RCA JacksTape Monitor Switch110/220 Voltage SwitchableRack Mount DesignDimensions: 19''W x 2.375''H x 8.5''DSold as : Unit
Question:	Is it suitable for mm phono cartridge
Answer:	Hi there,Thank you for your interest in our products. Pyramid PR2500/SEA2500X is rack mountable. It takes up 2 U-Spaces on the rack. Dimensions: 19''W x 2.375''H x 8.5''D.
Question:	Just purchased this unit. when i turn on the power switch the led light below it flashes red and blue. is there a problem with the unit
Answer:	It should work for any speaker system. The pre-amp is to boost the signal from a particular device, which then goes into your receiver or amplifier.

Product features

Bluetooth/RCA input modes seletable

The output is made of gold-plated RCA lotus seat, which is durable and beautiful!

The board layout is reasonable, beautiful, and the current is small

Bluetooth 5.0 Lossless transmission

Using original 6J1 Tube, Bluetooth 5.0 version;

Tube can be replaced with:6J1/6J2/6J4/6K4/GE5654/6AK5/6Ж1п

With Treble Bass Control

Treble & Bass control can achieve different sound style. Tube A3 PRO is a perfect Tube preamp for your home Audio Amplifier system,use it can to achieve purer music experience.

AUX/Bluetooth input Cutover Function

When you cutover to AUX Working mode,It's Red Light indicator

Switch working mode

Depress to switch bluetooth mode;

Red and Blue flashing;It's the status of Bluetooth waiting to be connected.

Bluetooth mode

Bluetooth connection is successful;

It's Blue Light indicator

6J1 Vacuum Tube Preamplifier With Bluetooth 5.0

1. The product is a Vacuum tube preamp, not a power amplifier or phono amplifier.And it can not be used in cars,turntables ,also cannot be used directly for headphones, speakers,pls see the product Connection Diagram！

2. Do not use cheap audio signal lines These lines are not shielded by themselves.the probability of the bottom noise current is very large, it is recommended to use a good audio cable or power supply.

3. Make sure that there is no problem with your own audio source. The preamplifier has its own preamplifier function. If the audio source itself has noise, then the preamplifier will only amplify its noise.Please use a good sound source test.

4. Check whether the tube is plugged into the base before to use.Be sure to the machine is energized and working normally.

5. The preamplifier has 3-5 times power amplification. If the sound is broken, you can adjust the volume control to control the power output to prevent breakage.

6.Because the production batch is different,Blue/AUX input select button have a little different,Pls know it.

More technical support,pls ask me:www.amazon.com/hz/help/contact/A3BG62S1F23IH5# .Or leave any of your instant messaging account and I'll contact you.thanks!