Features 1.High Performance: TPA3255 chip is a high performance amplifier chip, which has class D efficiency and can bring real high end sound quality. 2.Integration Feedback, Error Correction: HIFI digital power amplifier board features advanced integrated feedback design and proprietary high speed gate driver error correction function (PurePath? Ultra HD). 3.Low Distortion Sound: HIFI digital power amplifier board enables the device to maintain ultra low distortion in the whole sound frequency band, while exhibiting sound quality. 4.Loading Capacity: digital power amplifier board works in AD mode, and can drive up to two 315W 4R loads and two 150W (uncut power) 8R loads when THD is 1.5%. 5.Input Interface, Connection: Digital power amplifier board has a 2 VRMS analog input interface, which supports seamless connection with high performance DAC (such as PCM5242 of TI). 6.High Efficiency and Low Loss: Amplifier board has two advantages: high power efficiency and ultra low idle loss (less than 2.5W). It is realized by 85mR MOSFET and optimized gate driver scheme. specificationItem Type: HIFI Digital Power Amplifier Board_x000D_ Material: PCB_x000D_ Size: Approx. 110x70x30mm / 4.3x2.8x1.2in _x000D_ Power Amplifier IC: TPA3255 Chip_x000D_ Input Mode: 3.5mm Stereo Wired Socket (3P)_x000D_ Work Efficiency > 90%_x000D_ Output Power: 315W 4, Distortion 1.5%, 185W 8, Distortion 1.5%_x000D_ 260W 4, Distortion 1%, 150W 8, Distortion 1%_x000D_ Frequency Response: 20Hz to 20KHz_x000D_ Power Supply: DC19 to DC48V (Current is Recommended to be at 5A) PackageList1 xHIFIDigitalPowerAmplifierBoard 1 x 3 Pin Cable NotePlease allow some error in manual measurement.