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

Voltage
24 Volts (DC)
Manufacturer
Douk Audio
Maximum supply voltage
24 Volts
Minimum supply voltage
12 Volts
Mounting type
Surface Mount

🎵Supports Lossless Formats

📶Bluetooth 5.0

🔊50W x 4 Power

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€ 135.51

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Sold byAmazon PortugalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Elevate Your Audio Game!

HI FI QUALITY - Enjoy crystal-clear sound with high-quality components and design.
VERSATILE INPUTS - Supports both wired RCA and wireless connections for all your devices.
STYLISH DURABLE - CNC machined aluminum alloy case for a modern, robust look.
UNLEASH YOUR SOUND - Experience powerful 50W x 4 output for immersive audio.
SEAMLESS CONNECTIVITY - Bluetooth 5.0 ensures stable and fast wireless streaming.

The Douk Audio 4 Channel Bluetooth Amplifier delivers a powerful 50W x 4 output, featuring Bluetooth 5.0 for seamless connectivity and support for various audio formats. With versatile input options and a stylish aluminum alloy design, it's perfect for enhancing your home or office audio experience.

Specifications

ASIN	B0875WY9TX
Best Sellers Rank	#23,492 in Electronics ( See Top 100 in Electronics ) #116 in Audio Component Amplifiers
Brand	Douk Audio
Customer Reviews	4.2 4.2 out of 5 stars (363)
Manufacturer	Douk Audio
Mfr Part Number	SUC-M4
Model Number	SUC-M4
Number of Channels	4
Output Power	200 Watts
Output Wattage	50 Watts
Wattage	200 watts

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