Feature: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.Specification:Item Type: HIFI Digital Power Amplifier BoardMaterial: PCBSize: Approx. 110x70x30mm / 4.3x2.8x1.2in Power Amplifier IC: TPA3255 ChipInput Mode: 3.5mm Stereo Wired Socket (3P)Work Efficiency > 90%Output Power: 315W 4, Distortion 1.5%, 185W 8, Distortion 1.5%260W 4, Distortion 1%, 150W 8, Distortion 1%Frequency Response: 20Hz to 20KHzPower Supply: DC19 to DC48V (Current is Recommended to be at 5A).Package List:1 x HIFI Digital Power Amplifier Board1 x 3 Pin CableNote:Please allow some error in manual measurement.