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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Douk Audio M4

Product ID: 343986809

Details

Brand
Douk Audio
Compatible devices
Smartphone MP3
Connectivity technology
RCA Bluetooth
Controller type
USB Bluetooth
Special features
Built-In Input

🎵Supports lossless audio formats

📶Bluetooth 5.0 with high-gain antenna

🔊50W x 4 powerful channels

€ 194.27

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Description

🎧 Elevate your sound game with power, clarity, and style.

SLEEK DURABLE DESIGN - CNC-machined aluminum alloy chassis with anodized finish adds a modern, premium touch to any desktop or living space.
QUAD CHANNEL POWERHOUSE - Unleash 200W total output with independent volume control for each speaker—perfect for immersive home audio setups.
AUDIOPHILE GRADE SOUND CLARITY - Hi-Fi circuit design with separate small and large signal paths ensures crystal-clear, distortion-free audio.
FUTURE PROOF WIRELESS STABILITY - Advanced Bluetooth 5.0 with high-gain antenna guarantees faster, more stable connections—never miss a beat.
SEAMLESS MULTI SOURCE CONNECTIVITY - Switch effortlessly between wired RCA inputs, Bluetooth 5.0 streaming, and U-disk digital playback for ultimate versatility.

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 U-disk playback of multiple lossless audio formats. Built with a high-quality aluminum alloy case and advanced circuit design, it offers stable, Hi-Fi sound performance ideal for home or office audio systems.

Specifications

ASIN	B0875WY9TX
Best Sellers Rank	#152,000 in Electronics ( See Top 100 in Electronics ) #434 in Home Audio Amplifiers
Brand	Douk Audio
Customer Reviews	4.2 4.2 out of 5 stars (345)
Mfr Part Number	SUC-M4
Model Number	SUC-M4
Number of Items	1
Unit Count	1 Count

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€ 194.27

Duties & taxes included

In stock

Sold byAmazon LuxembourgDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Luxembourg.

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