Choice Square 100W 50Wx2 100W+50W*2 2.1 Channel Digital Audio Power Amplifier Board Bluetoth Wireless Modul

1.how to choose a power supply?

Subject: the proper power supply for the module is essential. the power supply requires low ripple in the output voltage and low internal resistance. the higher the voltage, the higher the current and, consequently, the higher the power. output.if you only have a 12v 2a adapter, you can use 3-4 inch speakers.if you have 19v5a or more, there is no problem in using 8-10 inches.the power supply must be of high quality.if the voltage is too low, the sound will be easily distorted after being amplified.if the current is too low to power the speaker, the voltage will be reduced, resulting in malfunction or poor sound quality.

It is recommended to use a 18v, 19v or 24v power supply with a current of more than 3a. if you only have a 9v or 12v power supply, or 1a or 2a, you can also use it, but the power will be limited. please note that when using it, increasing the volume to the maximum may cause

Distortion affects the sound quality.

2.how to choose a speaker?

Subject: the most commonly used speakers usually have an impedance of 4 ohms or 8 ohms. if your speaker has a low power, it could be between 20 and 50 watts, and it would still be usable. the power supply voltage should be lower to avoid the speaker burns out after amplification, for example, by choosing a power supply of less than 15v. if you have a 50w-200w speaker, don't worry about it burning out. you can choose a 12-24v power supply. the higher the voltage, the higher the sound or power that can be generated. the speaker power should not exceed 100w, otherwise the sound quality will be affected.

3.how do you select the audio input mode?

Subject: this audio amplifier module is based on the hardware priority principle. if the usb connection is established successfully, it means that the usb mode has been activated.

If the aux cable is connected, the device will operate in aux mode. if the usb device is not connected and the aux cable is not plugged in, bluetooth mode is activated, which allows automatic reconnection. a warning sound is emitted when the mode is changed. when selecting the usb audio input mode, it is important to note that the device can be directly connected to a computer or other device with usb audio output (no driver installation required), or can be directly inserted into a usb stick for use. the usb input is a lossless input, which offers good sound quality, without interference or noise.

4.no problem when the volume is low, but when it goes up, the sound becomes distorted.

Re: the sound is distorted. please use an adapter with a higher voltage level.

5.no problem when the volume is low, but when it goes up, does the sound freeze?

Re: the input power is insufficient and the power supply is intermittently turned off for safety reasons. please replace it with a higher power power supply. or the power is too high, the amplifier board overheats considerably and thermal protection is activated. reduce power consumption or increase heat dissipation.