XY-S350H TPA3251 220WX2+350W Bluetooth

Review and audio test of #XYS350H #TPA3251 220WX2+350W Bluetooth 5.0 Subwoofer Amplifier Board 2.1 Channel Power Audio Stereo #classD Amplifier Board Bass AMP.
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Model: #XY-S350H
Name: 2.1 channel Bluetooth audio power amplifier board
Power supply: DC12-38V/10A
Bluetooth version: 5.1
Audio channel: 2.1 channel

Frequency range: 20HZ--20KHZ
Audio input: Bluetooth+AUX+U disk+USB sound card
Audio output: left and right channels subwoofer
Volume adjustment: 360'encoder adjustment
Left(Right)channel max output power:220W/392-36VDC 175W/492-36VDC 100W/892--36VDC
subwoofer max output power:355W/22-36VDC 250W/392-36VDC 19W/492--36VDC
Self-protection Design: undervoltage, overtemperature, clipping,and short circuit protection
Unique function: Support Sinilink-app, modify the Bluetooth name, setthe Bluetooth password, turn off/on the prompt tone
Product net weight: 285g
Colour: black
Material: plastic
Size: 130 x 116 x 27mm
1. How to choose a power supply?
The power supply with the board is very important. The ripple of the selected power supply must be small. A power supply with a large ripple will cause the bottom noise of the power amplifier board to become larger and there will be current noise. The higher the voltage, the greater the current, and the more adequate the output power. The power supply is 12V1A and can be equipped with 34-inch speakers. If it is above 19V 5A, there is no problem with 8-10 inches, and the power supply must be highly regarded. If the voltage is too low, the amplified sound will easily cause sound distortion. If the current is too low, the speaker will pull down the voltage, which will result in abnormal operation or poor sound quality.
It is recommended to use a power supply of 18V19V24V with a current above 5A. If you only have 9V12V or 1A 2A power supply, it can be used but the power is low. When the volume is selected close to the maximum, it may be distorted and affect the sound quality.

2. How to choose a speaker?
Regarding speaker types: commonly used speakers are generally 4-8 ohms, which can be used. The left and right channel speakers need to be connected to full-range speakers or mid- to high-frequency speakers, and the power is between 20W-100W. The subwoofer speaker cannot be connected to an ordinary speaker, and a speaker with a subwoofer speaker must be connected with a power between 20-100. The dive frequency of the subwoofer speaker must be at least 50 Hz.
If your speaker has a low power, such as between 20W-50W, it can be used. You need a lower power supply voltage to prevent the speaker from burning after amplifying the sound. For example, choose a power supply below 15V.
If you are a 50W-100W speaker, don't worry about the problem of speaker burnout. You can choose a 12-24V power supply. The higher the selected voltage, the greater the sound or power that can be output. The speaker power should not exceed 100W, otherwise it will affect the sound quality.