ZK-TB21 TPA3116D2 bluetooth 5.0 Subwoofer Amplifier Board 50WX2+100W 2.1 Channel Power Audio Stereo Bass AMP

Specification Item Type Amplifier BoardModel ZK TB21Material electronic componentsColor Blackbluetooth Version 5 0 no shielding 10m Input sensitivity 500mVAudio Input AUX BluetoothChannel 2 1Chip TPA3116D2 with AM anti interference function Power DC12 24V 5AAdapter speaker 20 100W 4 8ΩOutput power Max 50W R and L channel Max 100W subwoofer Quantity 1 PcsPackage included 1 x Amplifier Board not include shell Question and answer 1 How to choose the power supply The power supply with the board is very key the selected power supply ripple must be small ripple large power supply will lead to power amplifier bottom noise there is a current sound The higher the voltage the higher the current and the higher the power output If you only have 12V 1A you can have 3 4 inch speakers If you are above 19V 5A no problem with 8 10 inches power must be highly valued If the voltage is too low and the sound is amplified it will easily cause sound distortion If the current is too low and the horn cannot be brought up the voltage will be pulled down which will lead to abnormal operation or poor sound quality It is recommended to use 18V19V24V power supply with current above 5A If you only have 9V12V or 1A 2A power supply you can also use it but with low power When using it choose the volume close to the maximum which may cause distortion and affect the sound quality 2 How to select speakers About the speaker type commonly used speakers are generally 4 8 ohms c