#WuzhiAudio 2.1 Class D Amp with Bluetooth, 200 Watt RMS, Review and Audio Test

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WuzhiAudio 2.1 Class D Amp with Bluetooth, 200 Watt RMS, Review and Audio Test
Product Name: 2.1 channel audio amplifier module
Product Model: ZK-MT21
Bluetooth Version: 5.0 (15 meters)
Input Sensitivity: 500mV
Audio Input: AUX + Bluetooth
Channel: 2.1
BUY from here: खरीदने के लिए यहाँ क्लिक करें
Power Range: DC 12-24 V / 5A above
Speakers: 20-100 W, 4-8 Ω
Output Power: Left and right channels 50W, Subwoofer 100W
Protection : Anti reverse connection. Overheat. Over current. Short circuit
Product Dimensions: 93mm*90mm*22mm
Package Weight: about 185g

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.

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