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 | L133*W128*H33mm |
| Input sensitivity | 0.775V | Total Weight | 0.52kg |
| Frequency response | 20Hz-20kHz(±3dB) | Package Dimension | L240*W210*H60mm |
| CH3&CH4 output range | 0.775V | Support music format | MP3，WMA,APE,FLAC,WAV |
Frequently Asked Questions
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.
No, it pairs silently and is experienced with OSM! highly regarded
Hello. Yes, this is feasible.
If the speaker power is too high, this problem could arise.
Hello. It cannot be immediately repeated. Audio input must be connected to CH3/4.
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.
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.
Hello. Only U-Disk is supported via its USB port.
Hello. Please depress the back panel key. It may simultaneously output to 4 channels.
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.
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.
Hello. Ceiling speakers are not compatible with it.
