100% brand new and high qualityThe subwoofer section of two new TDA7294 BTL output， low-pass filter frequency is adjustable in accordance with the home theater-style design (50-150HZ)， strong power! Left and right channels are served by two TDA7294， imported from Germany WIMA 2.2uF coupling capacitor input coupling capacitor， the sound more sweet! Board signal to noise ratio is extremely high， the ears close to the speaker can’t hear the hum! The best choice to upgrade the 2.1 amplifierYou have to add a at least 0.5kg heatsink to this board to make it work fine. If not， this baord may be get damaged. You can remove the insulation chip and add the heatsink. but it can get the heatsink electricity and get dangerous. Only for professionals! Parameters:The new ST imported laser dark word TDA7294;Power supply filter to 6 3300uF/63V Japanese Rubycon ruby imports capacitance， rectifier 25A imports rectifier flat bridge;PCB with 1.6mm thick double-sided sheet， 2.0 oz copper thickness， HASL process， to ensure good performance of the current size;Recommended power supply:Dual 18-28V ACOutput power: 2 × 80W +160 W subwoofer(Note: The left and right channels is recommended 6 to 8 ohm subwoofer speaker is best not to less than 8 ohms， otherwise the heat!)Size:(L*W*H)21.70*10.35*3.40cm/8.54"*4.07"*1.34"Quantity:1Pc