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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HiFi Bluetooth 5.0 Digital Power Amplifier Stereo 2/4 Channel Audio Amp 50W x 4

HiFi Bluetooth 5.0 Digital Power Amplifier Stereo 2/4 Channel Audio Amp 50W x 4

Product ID: 377694903

Details

Manufacturer
Douk Audio
Maximum Supply Voltage
24 Volts
Minimum Supply Voltage
12 Volts
Mounting Type
Surface Mount
Voltage
24 Volts (DC)

🎵Supports lossless MP3, FLAC, WAV, APE

🔊50W x 4 powerful channels

🔗Bluetooth 5.0 wireless input

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€ 168.88

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Description

🎧 Elevate your sound game—power, clarity, and style in one sleek amp!

SLEEK DURABLE DESIGN - Crafted from CNC-machined anodized aluminum, this amp blends premium aesthetics with long-lasting performance.
VERSATILE AUDIO INPUTS - Switch effortlessly between wired RCA, Bluetooth, and U-disk digital playback supporting all your favorite lossless formats.
QUAD CHANNEL POWERHOUSE - Deliver immersive sound with 4 independent 50W channels, perfect for multi-room or multi-speaker setups.
PRECISION VOLUME CONTROL - Customize audio levels independently on each channel to tailor sound perfectly for every room or speaker.
SEAMLESS BLUETOOTH 5 0 CONNECTIVITY - Experience ultra-stable wireless streaming from any device without the clutter of external antennas.

The Douk Audio HiFi Bluetooth 5.0 Digital Power Amplifier delivers 50W per channel across 4 channels with independent volume control. It supports wired RCA, Bluetooth 5.0 wireless input, and U-disk playback of multiple lossless audio formats. Encased in a durable CNC-machined aluminum alloy shell, it offers stable, high-fidelity sound ideal for home or office audio systems.

Specifications

ASIN	B0875WY9TX
Best Sellers Rank	#1,497,523 in Electronics ( See Top 100 in Electronics ) #2,073 in Hi-Fi Amplifiers
Brand	Douk Audio
Brand Name	Douk Audio
Customer Reviews	4.3 out of 5 stars 333 Reviews
Manufacturer	Douk Audio
Material Type	Aluminum
Maximum Supply Voltage	24 Volts
Minimum Supply Voltage	12 Volts
Model Number	SUC-M4
Mounting Type	Surface Mount
Number of Channels	4
Output Power	50 Watts
Specification Met	CE, FCC
Supply Current	4.5 Amps
Voltage	24 Volts (DC)

Reviews

N**C

Works great!

25.01.2026

ヒ**ロ

店舗で使用

使用方法は用途とは違いますが、４スピーカーそれぞれ音量調整をしたかった。アレクサでラジオを受信し、各部屋の広さに合わせて音量をコントロールしてます。モノラルの音源になってしまいますが

25.09.2025

G**R

Perfect amplifier.

31.07.2025

D**.

Excellent bang for the buck!

9.01.2026

D**E

Great 4 channel amps w/ Bluetooth, USB, Aux RCA's.

7.04.2025

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

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