1. TPA3156 series subwoofer high-fidelity 2.1 power amplifier board, on-board Bluetooth 5.0 chip, supports the installation of AUX (audio input) and USB (playing U disk and card reader), and can also install IR (remote control function) and AD_KEY ( button control)! 2. USB can support all lossless format audio file playback (WAV FLAC APE WMA MP3, etc.) a variety of audio formats! 3. TPA3156D2 power amplifier board output power: 2x70Wand140W4, power supply is 24V10A. (Amplification gain is 36dB for subwoofer and 32dB for left and right channels) 4. The gain of the bass channel of the power amplifier board is 36dB. The output power is relatively large, please try to connect a subwoofer speaker with a size of 6.5 inches or more and 4 and below 140W! 5. The gain of the left and right channels is 32dB, and it can be connected to a 3-6.5 inch high and low frequency speaker power amplifier board within 8 ohms and 30W. The power supply requirements are 8-24V (8V can be turned on, not 8V power supply can reach 2x70and140W) 24V5A power supply above To achieve the best output value, ( who use power below 21V are not responsible for the output effect) please use a power supply above 24V5A! Specification: Product name: 2.1 channel bluetooth power amplifier board Power amplifier chip: TPA3156D2x2 Bluetooth version: 5.0 Amplifier channel: 2.1 three-channel Supply voltage: DC8V-24V Supply current: 3A-10A Output power: 2x70and140W Output Impedance: 4 ohm Amplification gain: 36db-32db Distortion ratio: -1percent Product size: 96 x 40mm Wide voltage power supply: 8V-24V DC power supply (can not be connected to a transformer) Different voltage outputs different power: voltage X current = power (the conversion rate of this board is 90percent ) The digital power amplifier voltage activated outpu current parameters are as follows: 8V power supply maximum 3A current = 24W (total power) 90percent 12V power supply maximum 5A current = 60W (total power) 90percent 18V power supply maximum 6A current = 108W (total power) 90percent 24V power supply maximum 8A current = 192W (total power) 90percent That is to say, in the state of 8V power supply, the maximum current is 2A, that is, 3X8=24W and so on! Colour:blackandgreen Material:PCBandMetal Package Contents: 1 x 2.1 channel bluetooth power amplifier board Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.