1. Adopting a fever grade chip QCC3034+PCM5102+TPA3223+NE5532 (TI), supporting a 32bit 384KHZ sampling rate, aircooled heat dissipation, 1540VDC power supply, and sufficient power2. Adopting highpower 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 interference3. Using 5 TI NE5532 operational amplifiers to maintain signal purity and high fidelity sound quality, the DIP8 operational amplifier socket is fully goldplated with low transmission resistance and good transmission characteristics, allowing for free replacement of operational amplifiers4. 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, HDProduct name: 2.1 channel Qualcomm Bluetooth amplifier board 200W+200W+400WProduct model: APTX2Adapted power supply:The working voltage range is 1540VDC, and it is recommended to use a DC power supply with a voltage of 32V36V 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 ; 300@40V , 3 .Subwoofer 425W@40V 2 ; 200W@40V , 4 . 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 38 ohms and up to 200W; The subwoofer supports 28 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+subwooferPower amplifier chip: Two TI TPA3223Protection mechanism: Input undervoltage, input anti reverse connection, overheating, overcurrent, short circuit protection.Colour:Photo ColorMaterial:Plastictype:A: With pinPackage Contents:1 Amplifier BoardOnly 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 +/ 13cm.