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

Specifications Model 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 Protection Mechanism overvoltage undervoltage overhearing DC detection short circuit protectionSize 118x100x22mm 4 6x3 9x0 8inchNote Transition 1cm 10mm 0 39inchPlease allow 0 1cm error due to manual measurement pls make sure you do not mind before you bid Due to the difference between different monitors the picture may not reflect the actual color of the item Thank you Package Included 1 x ZK TB21 Amplifier BoardQA 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