Product selling points: 1. The product uses high voltage and capacity energy storage capacitors, with guaranteed quality 2. MCU measures voltage to eliminate sound, and accurately measures temperature to control fans 3. The product uses a lotus base, with reliable contact and good shielding performance 4. One click bridging, two speed gain selection, and free selection of temperature control/manual control fan 5. The product uses a dedicated inductor for digital power amplifiers, with high current, low magnetic loss, small parasitic capacitance, and low heat generation Product parameters: Product Name: 160W Dual Channel/220W Mono Pure Rear Stage Amplifier Board Power amplifier chip: TDA7498E Working voltage: The safe power supply voltage is 15-35V DC, and the maximum voltage is 36V. AC power cannot be used, and it is strictly prohibited to input the positive and negative poles in reverse. It is recommended to use a 32V, 8A or higher DC power supply. Maximum output power: stereo 160W+160W (speaker impedance 4 ohms, power supply 36V); Mono bridge output 220W (speaker impedance 3 ohms, power supply 36V) Adapted speaker: 4-8 ohms, 50-160W in stereo mode; In mono mode, 3-8 ohms, 50-220W. Heat dissipation : temperature controlled automatic air cooling, or manually selecting the fan to keep running. Gain selection: 1st gear GAIN=33.1dB/2nd gear GAIN=35.6dB Bridging mode: output end R+L+parallel output, R-L parallel output, No. 2 Dip switch is toggled to ON position. Please perform the above operations while the power is off. Material: plastic colour: black Package Contents: 1 x Digital Power Amplifier Board Only the above package content, other products are not included. Note: Light reflection 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.