2021 HiFi Bluetooth 5.0 Digital Power Amplifier Stereo 2/4 Channel Audio Amp 50W wholesale online x 4 online sale

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Support Bluetooth 5.0 input for better transmission stability and quality

With a toggle to switch among Bluetooth / U-Disk / RCA inputs

4 independent volume control for each output channel

CH3 and CH4 can be switched to achieve 4-CH amplifier / multi-room music system

Douk Audio M4

Packing List
  • 1*M4 Amplifier
  • 1*24V/4.5A Power Supply
  • 1 Set*Raw Cable Speaker Jacks
  • 1*Manual

Parameters

  • Channel: 2.0 / 4.0
  • Bluetooth version: 5.0
  • Speaker impedance: 4-8Ω
  • Max output power: 50W*4 (4Ω load)
  • SNR: ≥98dB
  • Input sensitivity: 0.775V
  • THD: 0.05%(1kHz 1W)
  • Frequency Response: 20Hz-20KHz(±3dB)
  • Working voltage: DC 12-24V

  • Model: Douk Audio M4
  • Audio input: Bluetooth/Stereo RCA/U-disk
  • Audio output: speaker sockets
  • U-disk support format: MP3, WMA, APE, FLAC, WAV...
  • U-disk capacity: max 32G
  • Dimensions(W*D*H): 128*134*33mm / 5.04*5.28*1.30in
  • Net weight: 540g / 1.19lb
  • Package weight: 1100g / 2.43lb

Panel Introduction

Using Guide

Douk Audio M4 Douk Audio M3 Nobsound TPA3116-5.1 LP-269S Douk Audio G3 Nobsound NS-01G PRO
Type Bluetooth Amplifier Bluetooth Amplifier Bluetooth Amplifier Bluetooth Amplifier Bluetooth Amplifier Bluetooth Amplifier
Max Power 50W x 4 50W x 2 + 100W SUB 50W x 5 + 100W SUB 45W x 4 50W x 2 50W x 2
Channel 2.0/4.0 2.1 (2.2) 5.1 4.0 2 2.0
Input Bluetooth 5.0 + RCA + 3.5mm AUX + U-disk Bluetooth 5.0 + RCA + U-disk 3 RCA Bluetooth + RCA + U-Disk + SD + FM Bluetooth 5.0 + 3.5mm AUX Bluetooth 5.0 + 3.5mm AUX + USB
Output 4 Passive Speakers / 2 Passive Speakers + Another M4 Amp Stereo Passive Speakers + Passive & Active Subwoofer 5 Passive Speakers + Passive Subwoofer 4 Passive Speakers Stereo Passive Speakers Stereo Passive Speakers
Tone Control
THD ≤0.05% ≤0.05% ≤0.04% ≤0.04% ≤0.04% ≤0.04%
SNR ≥98dB ≥98dB ≥98dB ≥80dB ≥98dB ≥98dB
Speaker Impedance 4~8ohm 4~8ohm 4~8ohm 4~8ohm 2~8ohm 4~8ohm
Power Supply 24V 4.5A 24V 4.5A 19V 4.74A 12V 5A 19V 4.74A 12V 5A
Douk Audio P1 Douk Audio X1 Nobsound G2 Little Bear T7 Little Bear MC104 PRO Douk Audio EleksTube
Type Bluetooth Tube Preamp & Headphone Amplifier Bluetooth Tube MM Phono Amplifier (320W) Subwoofer / Mono Channel Amplifier (100W) MM Phono Vacuum Tube Preamplifier 4(1)-IN-1(4)-OUT 3.5mm AUX Audio Switch IPS Nixie Tube Clock

Features & details

Features

  • One group of stereo RCA (CH3 and CH4) can be used as audio input or output by switching the selector, to acheive different demands
  • Supporting wired 2 groups of stereo RCA and wireless Bluetooth 5.0 input, compatible with most common audio device such as phones, computers, TVs, MP3, TV, CD players etc. With U-disk input, it can be used as a digital music player, supporting MP3, WAV, APE, FLAC and WMA lossless formats.
  • With 4 groups of speaker sockets output, they can output at the same time and each channel with independent volume control. Its max output power can reach 50W×4, and equipped with high-quality 24V/4.5A power supply, enough to drive most home speakers.
  • Reasonable circuit layout, concise wiring and high-quality components to ensure HiFi clear sound and long time stable work. Separate design of small and large signal circuit for better circuit protection. Unique Bluetooth design without any external antenna, very practical and beautiful.
  • Propersize with exquisite appearance, aluminum alloy case is CNC machined and with anodizing process, more fashionable and durable, very suitable for home, office and desktop audio system use.

Product information

Product Warranty: For warranty information about this product, please click here
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Customer Questions

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Q: When using Bluetooth as the input, will the audio be output to all 4 channels simultaneous…

A: Yes. in its simplest setup, there is basically Stereo, Left and Right audio channels, time…

Michael L. Rotolo | 1 year ago

Q: Does this have sufficient power to power 4 Aura ast-2b-04 shakers?

A: Yes I would think so, I run 4 Dayton Audio BST-1. Both 50W

eugene | 7 months ago

Q: Can the signal to channel 1/2 be repeated to channel 3/4?

A: Hello. It cannot be repeated directly. You need to connect audio input to CH3/4.

Seller DoukAudio | 1 year ago

Q: Can this unit be hooked up to a powered subwoofer from output

A: The last guy didn''t read "powered" in your question. I would think you could hook one of …

Trapper | 2 months ago

Customer reviews

4.4 out of 54.4 out of 5
69 global ratings

Top reviews from the United States

Michael L. Rotolo
5.0 out of 5 starsVerified PurchaseEarly Reviewer Rewards
Great little unit
Reviewed in the United States on September 9, 2020
I''d actually only give it 4.5 Stars, as there is a little bit of false advertising, but like most dating profiles, there was some exaggeration of its positive features. it says its a 50W x 4 channel system. This would mean its a 200W Amp. This is a relatively... See more
I''d actually only give it 4.5 Stars, as there is a little bit of false advertising, but like most dating profiles, there was some exaggeration of its positive features.

it says its a 50W x 4 channel system. This would mean its a 200W Amp. This is a relatively meaningless Peak value. A more Real World usable number is its RMS rating. The Power supply is 24 V at 4.5 Amps, providing a Total power capability of only 108 Watts, so that is really all you can get. And the lights, Bluetooth receiver, and other circuitry will take some of that too.

This little amp is [ probably ] only putting out about 22 to 24 Watts per channel RMS. Fully acceptable numbers. No need to indulge here. I have this hooked up to 4 speakers, each rated at 8 Ohm, in an Outdoor environment, using 14 Gauge multi-strand copper speaker cable, and it plays plenty loud. I have a SPL meter, but haven''t been bothered to check it, as the unit plays more than loud enough for normal back yards. It Won''t get you concert level volumes, but can be loud enough to irritate your neighbors, even if they are still in their house.

I''ve had it up to full volume with no distortion. I didn''t have any 4 ohm or 2 ohm speakers available to try, but I would expect 2 Ohm speakers at full volume to play louder, but with distortion at its limits.

There is no Fan, and it looks reasonably sealed to keep dust out. It doesn''t look weather proof, but it doesn''t claim to be. I currently have it installed Indoors, but do plan on moving it outside, under a covered deck. It wont get rained on directly, but there will be some high humidity exposure. This will probably void the warranty

I was surprised by its small form factor. it really is tiny. I actually like the removal Speaker cable mount. its a little awkward, but I found it easier to connect the speaker cables with the mount off the unit, and then press it on once all cables were locked down. The screws come all tightened, and you need to Loosen them before inserting the speaker cable.

Bluetooth range is fair. I have another similar Bluetooth receiver puck that puts out Line level and TOS-Link Fiber connections, which has a little better range, but this little unit reaches almost as far. This is a sealed metal unit, made with the finest chinesium steel available, and it appears the antenna is Inside. It might have been better to have an External antenna to get an extra 10+ feet of range, but it still reaches to about 30 feet in my setup, which does have an exterior wall it its path, with 2x6 stud, insulation, sheet rock wall, and hardy board like siding.

I haven''t purchased a second one yet, but I am tempted to get a second, and Daisy chain them so I can have a the same music playing on some indoor speakers at the same time. There are RCA style Input and Outputs on the back, which the documentation shows to be there for exactly this purpose.

Having Individual volume controls is a Plus and a Minus. There is no Master volume. but you can use your source device ( aka iPhone ) to adjust that. but you Do get the ability to raise or lower speakers individually, so you can Boost a far away speaker, or lower nearby speakers, to get a better overall level etc. The volume control knobs are anodized aluminum ( or aluminium if your in Europe / Canada )

I would buy again, and probably will.
20 people found this helpful
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Damien Dailidenas
5.0 out of 5 starsVerified Purchase
Great mini-amp for sim rig bass shakers
Reviewed in the United States on November 18, 2020
Using this to drive 4 bass shakers on a sim rig. Does the job and looks good doing it.
7 people found this helpful
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Amazon Customer
2.0 out of 5 starsVerified Purchase
Will not put out anything near 50 watts per channel
Reviewed in the United States on July 1, 2021
At about 1/2 volume it begins to distort and some channels just shut off. Up until the 50% mark it doesn''t sound too bad. So if that''s all you need for a small space, great. Keep your expectations low and you won''t have a problem. I expected a 50 watts per channel... See more
At about 1/2 volume it begins to distort and some channels just shut off. Up until the 50% mark it doesn''t sound too bad. So if that''s all you need for a small space, great. Keep your expectations low and you won''t have a problem.
I expected a 50 watts per channel amp to actually put out more than my old Toshiba from the 70s that is only rated at 15 watts per channel. It doesn''t. Unfortunately, my old Toshiba lost the left channel so I thought I''d upgrade to new technology with built-in bluetooth. This was a bad choice
I''m driving four 8 Ohm passive speakers from the 80s/90s rated at 100 W/ch. Should have been as easy application.
I just sent it back. Might stick with an old-school amp and continue to plug in bluetooth through the aux input.
However, other recommendations would be appreciated. Thanks for reading.
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David W
5.0 out of 5 starsVerified Purchase
Awesome little amp
Reviewed in the United States on May 3, 2021
I''m using this as an outdoor amplifier for 4 outdoor speakers that have 50W rms each, enough to power my outdoor 50W speakers. It provides clean power to each channel at full power. Not bad for smaller speaker systems that are 4 or 8 ohms. The best part is that I leave this... See more
I''m using this as an outdoor amplifier for 4 outdoor speakers that have 50W rms each, enough to power my outdoor 50W speakers. It provides clean power to each channel at full power. Not bad for smaller speaker systems that are 4 or 8 ohms. The best part is that I leave this ON 24/7 next to the pool area. Anyone within range, about 30 ft radius can connect to it. Enough distance that my neighbors can''t connect to it.

Great little unit! 100% recommend it for anyone going down this route and leaving it ON 24/7. It gets warm, but doesn''t overheat even in 110*F weather.
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Sien C.
5.0 out of 5 starsVerified Purchase
Perfect for in-wall speakers, Workaround for poor BT range
Reviewed in the United States on July 23, 2021
I moved into a house and found 4 in-wall speakers with functionality in question. I bought this little thing over nicer AV/receivers because I really just wanted some music playing ability (did not intend to make it a home theater system as I already have one). This little... See more
I moved into a house and found 4 in-wall speakers with functionality in question. I bought this little thing over nicer AV/receivers because I really just wanted some music playing ability (did not intend to make it a home theater system as I already have one). This little amp was perfect for that role! Quickly found all 4 speakers working well, with adequate volume (didn''t have to dial it up past 50%). The BT connected fast, well and as long as you were within about 10 meters, smooth.

The BT range was definitely a bit lacking, but I found a work around. I used a nest hub to connect to the amp instead. Then I was able to control spotify on my phone which controlled the music on the nest hub which allowed me to control volume and playlist from anywhere within wifi range!
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Henry
5.0 out of 5 starsVerified Purchase
Perfect little units!
Reviewed in the United States on August 27, 2021
Bought these to go in my outdoor tv cabinet around my pool. Wanted to run bluetooth from my tv and also run bluetooth for music from my phone. I originally thought I could only get 6 speakers out of two units, but that was not the case....ALL 8 speakers work!!... See more
Bought these to go in my outdoor tv cabinet around my pool. Wanted to run bluetooth from my tv and also run bluetooth for music from my phone. I originally thought I could only get 6 speakers out of two units, but that was not the case....ALL 8 speakers work!! BONUS!

Another bonus is that I can use one for my phone and the other for my tv without having to disconnect one or the other. Just have one unit connected to TV and one for the Phone. then depending on which you want to stream sound from....you put the little unit in BT/USB mode and other in AUX mode and vice versa. easy peasy!

It''s nice that it has volume control per speaker too as I plan to put these speakers in a circle around my pool and on my porch.....its nice that I can adjust volume to compensate for distance of where I normally sit in the pool or on the porch.

I''ll update this review if anything happens when I start using them more.
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HandsomeHal
3.0 out of 5 starsVerified PurchaseEarly Reviewer Rewards
Ok for the price
Reviewed in the United States on September 12, 2020
Bluetooth signal is weak and range is about 10 ft and needs other options for input ports. Otherwise good unit for the price.
3 people found this helpful
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B and B
3.0 out of 5 starsVerified Purchase
Ok
Reviewed in the United States on February 23, 2021
It’s ok. Sound is fine, nothing special. Bluetooth is weak - I used this for my 5th wheel trailer. It’s installed right in the middle, and it’s a sketchy connection at best from the bedroom. There are a few thin trailer walls between it and our bedroom, but I’m maybe 12... See more
It’s ok. Sound is fine, nothing special. Bluetooth is weak - I used this for my 5th wheel trailer. It’s installed right in the middle, and it’s a sketchy connection at best from the bedroom. There are a few thin trailer walls between it and our bedroom, but I’m maybe 12 feet away and it’s sketchy. I’m not sure I’d recommend this, but for the money if you are close to it it’s not too bad.
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