Now Its the latest version , it is the product after the change, which has completely improved the common problem of high voltage protection.The use of 50V is also completely normal, and the use of materials is also more feverish. The auxiliary power supply uses Class A linear power supply, which is more dynamic, and the sound quality is significantly improved It can perfectly drive 2-16 Euro speakers TPA3255 is a high-performance class D power amplifier chip, which has class D efficiency and can bring true high-end audio quality circuit. The device features advanced integrated feedback design and proprietary high-speed gate driver correction function (PurePath UHD).This technology can enable the device to maintain ultra-low distortion in the entire audio frequency band, while displaying sound quality. The device works in AD mode. When the is 1.5%, it can drive up to two 315W/4R loads and two 150W (unshipped power)/8R loads, and has a unique 2 VRMS analog input interface, which supports seamless connection with high-performance DAC (such as TIs PCM5242).In addition to audio performance, TPA3255 also has two advantages: efficiency and ultra-low power level idle loss (less than 2.5W). This can be achieved through 85mR MOSFET and optimized gate driver scheme. Compared with the discrete implementation scheme, this scheme can significantly reduce idle loss.Power amplifier IC: TPA3255 chipInput mode: 3.5M stereo wired socket interface (3P)Output power: 315W/4 Ohms, distortion 1.5% 185W/8 Ohms, distortion 1.5%, 260W/4 Ohms, distortion 19%, 150W/8 Ohms, distortion 19%Frequency response: 20Hz to 20KHzDynamic range: 100dBSignal-to-noise (): 111dbPower supply: the current from DCI9 to DC48V is recommended to be more an 5AColour:As ShownMaterial:PC+metalPackage Contents:1 x Amplifier Board(Without Bluetooth)Only the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real . The measurement allowed is +/- 1-3cm.