Douk Audio M4 4 Channel Bluetooth Amplifier
- 4 channels, 50W x 4 max
- Bluetooth 5.0 with high-gain antenna
- 2 stereo RCA inputs, one switchable to output
- USB disk playback: MP3, WAV, APE, FLAC, WMA
- Independent volume per channel
- 24V/4.5A power supply
- CNC aluminum alloy case
Last refreshed Jun 20, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A compact four channel amp that runs two pairs of speakers from Bluetooth, RCA or a USB stick with separate volume for each channel. Output and warranty specs are thin, so it suits desktop and small room systems.
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ASIN: B0875WY9TXModel: M4Category: Stereo Amplifiers
Overview
Home office and desktop audio fans get a small aluminum amplifier that powers four speakers at once from Bluetooth, two RCA sources or music files on a USB drive. Each channel has its own volume control.
Four independent channels let one box run two rooms or two speaker pairs at different levels. Specs beyond power and inputs are not listed, so demanding speakers may need more amplifier.
Who it's for
Hobbyists powering bookshelf speakers in a study, garage or shop. Theater builders need a receiver with decoding and video switching.
Pros and cons
- Four independent channels
- Bluetooth plus two RCA inputs
- Plays lossless files from USB
- Switchable RCA input or output
- Warranty not stated
- No HDMI or optical
- Small size limits power for big speakers
Performance notes
Power is shared across four channels, so it drives efficient bookshelf speakers comfortably while large floorstanders need more headroom. Separate small and large signal circuits reduce interference. Bluetooth range and stability come from the high gain antenna.
Specifications
| Brand | Douk Audio |
|---|---|
| Model | M4 |
| Capacity & performance | |
| Output Power | 50W x 4 max |
| Power & efficiency | |
| Power Source | 24V/4.5A power supply |
| Construction & materials | |
| Enclosure Material | CNC machined anodized aluminum alloy |
| Compatibility & installation | |
| Connectivity Technology | 2 stereo RCA (one switchable in/out), Bluetooth, USB disk |
| Warranty & support | |
| Supported streaming | MP3, WAV, APE, FLAC, WMA from USB |
| Other details | |
| Wireless Technology | Bluetooth 5.0 |
| Control Type | Independent volume per channel |
| Number of Channels | 4 |
Frequently asked questions
How do I connect speakers to the Douk Audio M4?
Wire passive speakers to the 4 groups of speaker sockets. All four outputs work at the same time with independent volume.
Can the Douk Audio M4 play music from a USB stick?
Yes. U-disk input plays MP3, WAV, APE, FLAC and WMA.
Can the Douk M4 send audio to a subwoofer or another amp?
One stereo RCA group (CH3 and CH4) can be switched to work as an output.
Is a power supply included with the Douk Audio M4?
Yes. It comes with a 24V/4.5A power supply.