Douk Audio M4 4 Channel Bluetooth Amplifier Instruction Guide
- June 4, 2024
- Douk Audio
Table of Contents
Douk Audio M4 4-Channel Bluetooth Amplifier
Introductions
Thank you very much for choosing our products! Please read this manual carefully before using the product.
Front & Back panel interface function description
- POWER NO/OFF(Input signal switching button）
- Previous button
- Play pause / U disk, Bluetooth switch button (short press play, pause, long press to switch U disk and Bluetooth input)
- Next button
- Power Indicator Light
- Bluetooth/U-Disk INDICATOR LIGHT
- U-disk interface
- CH4 independent volume knob (clockwise increase, counterclockwise decrease)
- CH3 independent volume knob (clockwise increase, counterclockwise decrease)
- CH2 independent volume knob (clockwise increase, counterclockwise decrease)
- CH1 independent volume knob(clockwise increase, counterclockwise decrease)
- CH1&CH2 audio input interface (Such as CD, DAC decoder, mobile, phone, TV, etc., red to CH1 channel input, white to CH2 channel input)
- CH3&CH4 audio source input or cascade output
- CH3&CH4 working mode switch key (CH3&CH4 is the input mode of sound source when the switch is pressed, and the output mode of sound source when the switch is pressed)
- Speaker interface (connect 4 speakers according to the product instructions)
- Power interface(DC power shall not exceed 24V)
Operation Steps
- Make sure the VOL button to the minimum.
- Connect the speakers according to the rear panel interface, pay attention to distinguish between positive and negative.
- Connect the sound source that needs to be used(Optional RCA/Bluetooth, U disk）
- If the current playback state, inserting a U-disk will automatically jump to the U-Disk mode.
- When you need to play the same audio source, but the number of speakers is greater than 4, you can choose CH3/CH4 as the audio output, and then connect to the next power amplifier. You can connect multiple power amplifiers and connect multiple speakers in turn
- Connect the power adapter.
- Turn on the power and switch to the current input audio source.
Specifications
| Maxpower output | 50W*2 4Ωload | THD | 1W 0.05% |
|---|---|---|---|
| Speaker matching impedance |
4-8Ω
|
SNR
|
≥98dB
Working voltage| 12-24V| Bare metal size| L133W128H33mm
Input sensitivity| 0.775V| Total Weight| 0.52kg
Frequency response| 20Hz-20kHz(±3dB)| Package Dimension| L240W210H60mm
CH3&CH4 output range| 0.775V| Support music format| MP3，WMA,APE,FLAC,WAV
Frequently Asked Questions
Is there enough power here to run four Aura ast-2b-04 shakers?****
The 35 watt ceiling speakers I have have plenty of loudness. If it didn’t work, you may always try it again or return it. Very compact footprint and great amp for the money.
Does this device emit obnoxious Bluetooth pairing signals?****
No, it pairs silently and is experienced with OSM! highly regarded
Will any amplifier work with channels 3 and 4? For instance, if I currently own a Douk M3 amplifier, can I utilise it in place of a second M4 amplifier for multi-room audio?****
Hello. Yes, this is feasible.
My device beeps or hums softly while cutting in and out at low volume settings. Has anyone else had this happen to them before I request a replacement?****
If the speaker power is too high, this problem could arise.
Can channel 1/2’s broadcast be replayed on channel 3/4?****
Hello. It cannot be immediately repeated. Audio input must be connected to CH3/4.
After 6 months of use, the Bluetooth is no longer able to link. Is that fixable in any way?****
This problem occurs, and it is not exclusive to this gadget; it affects a lot of Bluetooth devices. The simplest solution, in my opinion, is to just “Forget this device” on your phone or other source audio device, which will remove it from your list of playing devices. You may then “Re-Learn” or “Re-Discover” it.
What is the Bluetooth connection range?****
I have four speakers installed in a patio’s exterior ceiling and my unit is indoors. While carrying my phone, I have walked up to 50 feet away from the unit without losing a Bluetooth signal. I have four of these wonderful devices.
Can my PC’s USB port be used to receive audio?****
Hello. Only U-Disk is supported via its USB port.
Only channels 1 and 2 in Bluetooth provide audio. How can you simultaneously use Bluetooth on channels 3 and 4?****
Hello. Please depress the back panel key. It may simultaneously output to 4 channels.
Bluetooth no longer connects and is not discoverable after three weeks of ownership. Does this have a fix?****
1. Disconnect the AC cord for 10 metres.
2. On your source device, navigate to Bluetooth settings and uninstall the
amp that was previously installed.
3. Try scanning once more.
Has anyone tried using Bluetooth to link to a Google device for audio output?****
Hello. Only input via Bluetooth, not output, is supported. It can pick up Bluetooth signals from your phone, computer, etc. and then send them over wires to speakers.
Does it function with four Saros Express 6.5-inch, 2-way ceiling speakers?****
Hello. Ceiling speakers are not compatible with it.