New board 7.1 power amplifier board 12-24V DC power amplifier board Pure post-stage power amplifier, switch machine control circuit to prevent impact horn. There are voltage, load short circuit protection, the program is mature and stable. This set of power amplifier boards is suitable for 20-40 flat living room, bedroom, demonstration hall, hotel and other medium power audio systems. Two-way bass output for better boost of the dual subwoofer system. Control signal STB: 0V standby, energy saving, no heat Signal input: standard 7.1 signal 1.4V Input power: DC voltage 12-19V-24V power is not less than 150 watts, power amplifier power should be enough to avoid volume full power protection Output power: 24V power supply       RL main box: 2*50W/6 ohms       RL side surround speakers: 2*50W/6 ohms       RL rear surround speaker: 2*50W/6 ohms       Center Speaker: 1*100W/3 Euro       Subwoofer : 2*100W/3 ohm (two-channel power amplifier output, can be connected to double SUB or double voice coil woofer) Note: The horn impedance is the lowest parameter and can be matched to the power of each channel according to the power supply voltage adjustment. 7.1 There are many input signal lines in the system, it is easy to be disturbed and cause noise. It is recommended to use a slightly better signal line. The signal line inside the machine should not be too long. The signal line needs to be twisted or shielded. Multiple potentiometers require effective grounding.