1. Adopting a fever grade chip QCC3034+PCM5102+TPA3223+NE5532 (TI), supporting a 32bit 384KHZ sampling rate, air-cooled heat dissipation, 15-40VDC power supply, and sufficient power 2. Adopting high-power digital power amplifier dedicated inductors, high current, low magnetic loss, low heat generation, and using oxygen free copper wires to improve sound quality; The magnetic shielding mechanism is resistant to electromagnetic interference 3. Using 5 TI NE5532 operational amplifiers to maintain signal purity and high fidelity sound quality, the DIP8 operational amplifier socket is fully gold-plated with low transmission resistance and good transmission characteristics, allowing for free replacement of operational amplifiers 4. Subwoofer signal output expansion port, compatible with -3002, karaoke board expansion port, supporting the installation of -AMP QCC3034 Qualcomm module, supporting transmission encoding , AAC, , -LL, -HD Product name: 2.1 channel Qualcomm Bluetooth amplifier board 200W+200W+400W Product model: -APTX2 Adapted power supply: The working voltage range is 15-40VDC, and it is recommended to use a DC power supply with a voltage of 32V-36V and a current of 10A or more. Be careful not to use AC power directly from the transformer. It must be rectified, filtered, and tested for within 40V before wiring can proceed. Maximum power: Left or right vocal tract-- 200W@40V , 4 Ω; 300@40V , 3 Ω. Subwoofer-- 425W@40V 2 Ω; 200W@40V , 4 Ω. In short, the higher the voltage, the smaller the resistance, and the greater the output power. Adapted speakers: left and right channels, supporting speakers up to 3-8 ohms and up to 200W; The subwoofer supports 2-8 ohms and speakers up to 400W. Bluetooth chip: QCC3034, transmission distance of 15 meters. Input :Bluetooth+AUX, Bluetooth priority, Bluetooth needs to be disconnected when using audio cable input. Number of channels: 2.1, left channel+right channel+subwoofer Power amplifier chip: Two TI TPA3223 Protection mechanism: Input undervoltage, input anti reverse connection, overheating, overcurrent, short circuit protection. Colour:Photo Color Material:Plastic type:B: Package Contents: 1 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.