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 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 MP3, WAV, APE, FLAC, WMA lossless

🔊50W x 4 max output power

🔗Bluetooth 5.0 + wired RCA inputs

A$224

Duties & taxes included

In stock

Sold byAmazon AustraliaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎧 Elevate your soundscape — power, precision, and style in one sleek amp!

SLEEK DURABLE DESIGN - CNC-machined aluminum alloy chassis with anodized finish combines modern style with long-lasting durability.
LOSSLESS AUDIO PLAYBACK - Built-in U-disk player supports multiple high-res formats, ensuring your playlists sound studio-quality.
VERSATILE INPUT OPTIONS - Seamlessly switch between Bluetooth 5.0 wireless and dual wired RCA inputs for ultimate connectivity freedom.
POWERFUL 4 CHANNEL OUTPUT - Delivers 50W per channel to energize any home speaker setup with crystal-clear HiFi sound.
INDEPENDENT VOLUME CONTROL - Fine-tune each speaker’s volume individually for a perfectly balanced immersive audio experience.

The Douk Audio M4 is a compact yet powerful 4-channel digital amplifier delivering 50W per channel with Bluetooth 5.0 and wired RCA inputs. It supports multiple lossless audio formats via U-disk playback and features independent volume controls for each speaker output. Housed in a CNC-machined aluminum alloy case, it offers a stylish, durable solution for home and office audio systems.

Specifications

ASIN	B0875WY9TX
Best Sellers Rank	#152,570 in Electronics ( See Top 100 in Electronics ) #221 in Hi-Fi Amplifiers
Brand Name	Douk Audio
Customer Reviews	4.2 4.2 out of 5 stars (346)
Manufacturer	Douk Audio
Manufacturer Part Number	SUC-M4
Model Number	SUC-M4

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