XH-A374 50Wx4 4 Channel TDA7850 bluetooth 4.0 Channel HIFI Auido Power Amplifier Class-AB Four Channels Amplifier Board for Home Car Audio

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About this item

Power amplifier chip: TDA7850 
Chip type: Class AB (A and B)
Working voltage: DC 12-14.4V 
Standby current:
Number of channels: 4 channels (Stereo * 2 + stereo * 2)
Output power: 50W*2+50W*2(4ohm) 
Signal to noise ratio: 88%
Size: 126 x 95 x 29 mm
Installation hole distance: 118x87 mm


1. Bluetooth connection problem?
Answer: The Bluetooth indicator flashes regularly when it is working normally. If it is on or off, it may be a problem with the Bluetooth module. You can contact customer service to handle it.

2. The mobile phone can be connected but the laptop or desktop cannot be connected?
Answer: If the mobile phone can connect and play music, it means there is no problem with the Bluetooth amplifier board. It may be a problem with the Bluetooth driver of the computer. The version is too old or there are files missing. It is recommended to uninstall and then install the latest version of the driver.

3. When the volume is turned up, the sound appears to be stuck, intermittently, and can be played for a long time after the volume is turned down?
Answer: Reason one: Because the power of the power supply is too small, the total output power of this power amplifier board is 200W. The recommended voltage for power supply selection is 12V and the current is above 18A.
Reason 2: If the power supply is okay, it may be that the power of the speaker is too small, such as outputting 200W, but connecting a 5W speaker. When the volume is turned up, there will be a stuck phenomenon, and the speaker may be burned.

4. There is too much noise when playing music, or there is noise when not playing music?
Answer: The function of the power amplifier board is signal amplification. The main source of noise is the radio clutter in the environment that is amplified by the power amplifier board. Therefore, as long as the power amplifier board will have noise, it is recommended to select the audio cable with shielding function as much as possible It may be that the sound source is noisy, and normal mobile phones and MP3s will not. Most of them are on some old pre-boards, which are not compatible with our power amplifier board. You can add audio isolators or couple capacitors to test. See if you can Cannot be removed.

Package Incldued:

1 x XH-A374 50Wx4 4 Channel bluetooth HIFI Auido Power Amplifier

Shipping information

(1) FREE Shipping 10 - 15 business days, (2) Standard Shipping 7 - 12 business days.

Shipping and Delivery Estimates

We ship in-stock orders as soon as possible. This is often within two business days, but there are situations where it may take longer. All estimates are based on business days.


(1) The shipping time mentioned above refers to the estimated time of business days that the shipment will take after an order has been shipped.

(2) Business days do not include Saturday/Sunday and any public holidays.

(3) These estimates are based on normal circumstances and are not a guarantee of delivery times.

(4) We are not responsible for the failures or delays in delivery resulting from any force majeure event, such as natural disaster, bad weather, war, customs issues, and any other event beyond our direct control.

Return and exchanges

Our policy lasts 14 days. If 14 days have gone by since your purchase, unfortunately we can't offer you a refund or exchange. To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

for more information please visit our Refunds & Returns Policy page.