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, WAV, APE, FLAC

📶Bluetooth 5.0 stable wireless

🔊50W x 4 powerful output

HK$1198

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Description

🎧 Elevate your sound game — power, precision, and wireless freedom in one sleek amp!

QUAD CHANNEL POWERHOUSE - 50W per channel delivers immersive, room-filling sound for any space.
PRECISION VOLUME CONTROL - Independently adjust each channel’s volume for perfect audio balance.
NEXT LEVEL WIRELESS RANGE - Bluetooth 5.0 with high-gain antenna keeps your music streaming uninterrupted across your entire home or office.
HI FI CLARITY DURABILITY - Premium aluminum CNC-machined case with advanced circuit design ensures crystal-clear sound and long-lasting performance.
SEAMLESS MULTI INPUT FLEXIBILITY - Switch effortlessly between Bluetooth, dual RCA, and USB digital playback.

The Douk Audio M4 is a 4-channel Bluetooth amplifier delivering 50W per channel with versatile input options including Bluetooth 5.0, dual RCA, and USB for lossless audio formats. Its independent volume controls and high-quality aluminum chassis provide professional-grade Hi-Fi sound and durability, making it ideal for home, office, or workshop audio setups.

Specifications

ASIN	B0875WY9TX
Best Sellers Rank	#21,948 in Electronics ( See Top 100 in Electronics ) #108 in Audio Component Amplifiers
Brand	Douk Audio
Customer Reviews	4.2 4.2 out of 5 stars (369)
Manufacturer	Douk Audio
Mfr Part Number	SUC-M4
Model Number	SUC-M4

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HK$1198

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered 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 Hong Kong.

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