1. TPA3118D2 high power amplifier board 2 x 30W 8 ohm +60W 4 ohm output, this board uses official standard circuit to open enough power and low heat, 32dB gain test2. When the volume is not plugged in, the volume is turned up to the maximum and the low noise is not heard. As long as the power supply does not interfere with the power amplifier board itself, there is no interference, as long as you connect the audio cable. If there is no interference, then it is perfect.3. This circuit design uses the test application circuit of TPA311X chip instead of the official standard circuit, so please do not make any changes to the circuit of the component on the power amplifier board, so as to avoid unnecessary loss caused by overheating of the chip Power supply: DC15-25VCurrent: 4A or moreFrequency response range: 20-18.5KHzHarmonic distortion: THD-1%Model Number: TPA3118DD2Maximum Power Per Channel: 60WChannels: 3 (2.1)colour:Black+greenMaterial:PCB+Plastic+MetalPackage Contents:1 x TPA3118D2 Subwoofer Amplifier BoardOnly the above package content, other products are not included.Note: Light shooting 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.