What devices are compatible with the Bluetooth 5.0 input?

Most common audio devices such as phones, computers, TVs, MP3 players, CD players.

What audio formats are supported by the U-disk input?

MP3, WAV, APE, FLAC and WMA lossless formats.

What kind of circuit design does it feature?

It has a reasonable circuit layout, concise wiring, high-quality components, and separate designs for small and large signal circuits for HiFi clear sound and stability.

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 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. It's 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, has 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.

Does this unit produce annoyingly loud Bluetooth pairing indications? I have one that does, I want to replace it because it's so bad.

No, it pairs quietly, unlike our failed Pyle unit... that was very annoying.

Can you control the volume in each side speaker on RCA output channel?

Hello. The volume of each channel can be adjusted by the red pot separately.

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Douk Audio

4 Channel Bluetooth Amplifier, 50W x 4 Audio Power Amp, Hi-Fi Home Stereo Speaker Receiver [Douk Audio M4]

Item #:25249148

4.7 rating

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PKR 32931

This product is not Fulfilled by Ubuy and can take minimum 10 days in delivery. We might cancel the product from the order and refund you if any issue arise with the delivery of this product.

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The 4 Channel Bluetooth Amplifier delivers powerful and clear Hi-Fi sound with its 50W x 4 audio power output and supports versatile wired and wireless audio input sources such as phones, TVs, and U-disks.

Product Details

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Features & Benefits

50W x 4 audio power output
Supports wired and wireless audio input sources
Compatible with most audio devices
4 groups of speaker sockets output, each channel with independent volume control
Circuit design for HiFi clear sound and stability
Exquisite and durable aluminum alloy case design

Product Description

4 Channel Bluetooth Amplifier, 50W x 4 Audio Power Amp, Hi-Fi Home Stereo Speaker Receiver [Douk Audio M4]

Overview

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Customer Questions & Answers

Question : What devices are compatible with the Bluetooth 5.0 input?
Answer : Most common audio devices such as phones, computers, TVs, MP3 players, CD players.
Question : What audio formats are supported by the U-disk input?
Answer : MP3, WAV, APE, FLAC and WMA lossless formats.
Question : What kind of circuit design does it feature?
Answer : It has a reasonable circuit layout, concise wiring, high-quality components, and separate designs for small and large signal circuits for HiFi clear sound and stability.
Question : When using Bluetooth as the input, will the audio be output to all 4 channels simultaneously?
Answer : 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 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. It's pretty well explained in the manual and in the details of the Item Description if you cared to read it.
Question : At low volume levels my unit cuts in and out, with an accompanying soft hum/beep. Before I ask for a replacement, has anyone else experienced this?
Answer : Hello. Could you please send us a message on Amazon with more details? This issue may happen if the speaker power is too high.
Question : Does this have sufficient power to power 4 Aura ast-2b-04 shakers?
Answer : 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.
Question : Does this unit produce annoyingly loud Bluetooth pairing indications? I have one that does, I want to replace it because it's so bad.
Answer : No, it pairs quietly, unlike our failed Pyle unit... that was very annoying.
Question : Can I use any amplifier for channel 3 and 4? For example, I have the Douk M3 amplifier already, can I use this in place of a second M4 amp for multi-room?
Answer : Hello. Yes, this can work.
Question : Can you control the volume in each side speaker on RCA output channel?
Answer : Hello. The volume of each channel can be adjusted by the red pot separately.
Question : Aside from switching the device into Bluetooth via the left toggle, is there a way to put the amp into 'pairing mode'?
Answer : Sorry, no other ways.
Question : If connected to my PC through the audio jack to RCA, will I have all 4 channels working (left, right, front, and back)?
Answer : Yes.

Customer Ratings

4.7 out of 5

197 customers ratings

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4 Channel Bluetooth Amplifier, 50W x 4 Audio Power Amp, Hi-Fi Home Stereo Speaker Receiver [Douk Audio M4]

The 4 Channel Bluetooth Amplifier by Douk Audio M4 offers good volume and a small footprint. However, it is important to note that to get all four speakers to play from the same source, you need to split the signal and connect to both sets of RCA jacks on the back, which is not documented. Some customers have also reported issues with the layout and connector quality. Additionally, there have been complaints about the amplifier cutting out and falling apart. Overall, it is recommended to check the compatibility and consider these drawbacks before purchasing.

Pros

Good volume
Small footprint

Cons

Signal splitting required for all four speakers
Layout design issues
Connector quality concerns
Amplifier cutting out and falling apart

Important Information

Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
Not all the products listed on Ubuy are for sale, as Ubuy is a global search engine. Products are subject to export/trade regulations.

4 Channel Bluetooth Amplifier, 50W x 4 Audio Power Amp, Hi-Fi Home Stereo Speaker Receiver [Douk Audio M4]

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