When using Bluetooth as the input, will the audio be output to all 4 channels simultaneously?

Yes. in its simplest setup, there is basically Stereo, Left and Right audio channels, times two If you want it to work that way. OR, if you want/need to something more complex, you can change the mode of operation by pressing a button in the back, and have 2 separate Stereo feeds. One Stereo feed for channel 1 and 2, and a different Stereo feed for channel 3 and 4 by using the RCA jacks on the back. Its pretty well explained in the manual, and in the details of the Item Description if you cared to read it.

At low volume levels my unit cuts in and out, with an accompanying soft hum/beep. Before I ask for a replacement, ahs anyone else experienced this?

Hello. Could you please send us a message on Amazon with more details? This issue may happen if the speaker power is too high.

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

I have 35 watt ceiling speakers and the volume is very sufficient. You could always try it or send it back if it didn't work. Great amp for the price and very small footprint.

Is there a way to hook up a master volume switch to this unit, any ideas???

Hello. You can add a volume control before this device. For example, https://www.amazon.com/dp/B07GRLV7XG?ref=myi_title_dp

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4 Channel Bluetooth Amplifier, 50W x 4 Audio Power Amp, Hi-Fi Home Stereo Speaker Receiver [Douk Audio M4]

Product ID: 221372437

Details

Brand
Douk Audio
Manufacturer
Douk Audio
Number of Channels
4
Output Power
200 Watts
Output Wattage
50 Watts
Wattage
200 watts

🎵Supports lossless MP3, FLAC, WAV

🔊50W x 4 powerful channels

🔗Bluetooth 5.0 stable wireless

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Description

🎧 Elevate your sound game with the Douk Audio M4 — where power meets precision.

HI RES AUDIO PLAYBACK - Built-in U-disk player supports MP3, WAV, APE, FLAC, and WMA formats—experience your music in pristine lossless quality.
PREMIUM BUILD DESIGN - Sleek CNC-machined aluminum alloy chassis with anodized finish combines durability with modern aesthetics for your home or office setup.
QUAD CHANNEL POWERHOUSE - Unleash 200W total output with independent volume control for each speaker—perfectly tailored sound for every corner of your space.
STABLE CLEAR SOUND ENGINEERING - Advanced circuit layout with separate signal paths ensures Hi-Fi clarity and long-term reliability—because your audio deserves the best.
SEAMLESS MULTI SOURCE CONNECTIVITY - Switch effortlessly between wired RCA inputs and Bluetooth 5.0 wireless streaming for ultimate device compatibility and convenience.

The Douk Audio M4 is a 4-channel Bluetooth amplifier delivering 50W per channel with independent volume controls. It supports wired RCA and Bluetooth 5.0 inputs, plus a U-disk player compatible with multiple lossless audio formats. Housed in a durable anodized aluminum case, it offers Hi-Fi sound clarity and stable performance, ideal for home and office audio systems.

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ASIN	B0875WY9TX
Best Sellers Rank	#18,563 in Electronics ( See Top 100 in Electronics ) #87 in Audio Component Amplifiers
Brand	Douk Audio
Customer Reviews	4.2 4.2 out of 5 stars (365)
Manufacturer	Douk Audio
Mfr Part Number	SUC-M4
Model Number	SUC-M4

4 Channel Bluetooth Amplifier, 50W x 4 Audio Power Amp, Hi-Fi Home Stereo Speaker Receiver [Douk Audio M4]

Details

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Description

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Common Questions