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


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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.



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Product Description

douk audio m4 bluetooth amplifierdouk audio m4 bluetooth amplifier

Support Bluetooth 5.0 InputSupport Bluetooth 5.0 Input

With A Toggle To Switch Among Bluetooth / U-Disk / RCA InputsWith A Toggle To Switch Among Bluetooth / U-Disk / RCA Inputs

4 independent volume control for each output channel4 independent volume control for each output channel

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

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 M4Douk Audio M4


Packing ListPacking List

Packing List

  • 1*M4 Amplifier

  • 1*24V/4.5A Power Supply

  • 1 Set*Raw Cable Speaker Jacks

  • 1*Manual

Douk Audio M4


  • 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

Panel IntroductionPanel Introduction

Using Guide

Using GuideUsing Guide

Douk Audio M4

Douk Audio M3




Nobsound NS-01G PRO

Douk Audio M4

Douk Audio M3

Nobsound TPA3116-5.1


Douk Audio G3

Nobsound NS-01G PRO


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



2.1 (2.2)






Bluetooth 5.0 + RCA + 3.5mm AUX + U-disk

Bluetooth 5.0 + RCA + U-disk


Bluetooth + RCA + U-Disk + SD + FM

Bluetooth 5.0 + 3.5mm AUX

Bluetooth 5.0 + 3.5mm AUX + USB


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
















Speaker Impedance







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


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

Specification: HiFi Bluetooth 5.0 Digital Power Amplifier Stereo 2/4 Channel Audio Amp 50W x 4

Package Dimensions

11.54 x 8.9 x 2.44 inches

Item Weight

2.35 pounds



Customer Reviews

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Best Sellers Rank

#29,022 in Electronics (See Top 100 in Electronics)#159 in Audio Component Amplifiers

Date First Available

April 16, 2020


Douk Audio

10 reviews for HiFi Bluetooth 5.0 Digital Power Amplifier Stereo 2/4 Channel Audio Amp 50W x 4

5.0 out of 5
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  1. Tim S.

    I purchased this to use as a volume controller (4 zones) and amp for ceiling speakers in my mom’s house. She’s 83 years old. This amp is easy to use and has a tiny footprint (sitting on her counter). I’m very impressed!! Would definitely buy again. 😊

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  2. David W

    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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  3. Mike & Beck

    Did neighhood backyard movies with this amp and some big home speakers (Bill and Teds). Voices were clear and there was lots of power for some action scenes. Very good Class D amp and easy to connect to bluetooth.

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  4. Henry

    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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  5. Michael L. Rotolo

    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 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 warrantyI 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 2×6 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.

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  6. michael Schaadt

    We had one of these that came with the ceiling speakers which was not good at all. It would constantly lose BT connection. This one works great! It is heavy which appears to be connected to how well it is made. And it works well. I had no issues connecting and its been performing very well with plenty of volume.

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  7. Sien C.

    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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  8. Ryan J. Smith

    So easy to setup and it just works. Incredible range. I have mine (two of them) mounted inside to cover my outdoor speakers. Fantastic, regardless of the price. Pair with Spotify and a poor mans Sonos is in your future.

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  9. Steve

    Easy set up for 4 speakers. Had it for a few weeks and works great. Compact.

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  10. Damien Dailidenas

    Using this to drive 4 bass shakers on a sim rig. Does the job and looks good doing it.

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


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