This stereo mid-power digital audio amplifier board is capable of delivering 30W output power per channel into a 4Ohm load based on Class D topology and TAS5756 chip, featuring high efficiency up to 90% and high sound quality with low distortion and low noise level. AA-AB32255 supports 3-wire I2S input, suitable for connecting with for in DIY applications. Compact size, easy installation and mid power output makes this audio amplifier board suitable for home audio, car audio and demanding industrial applications. Besides amplifier board, AA-AB32255 can work as a high performance DAC. A DC10V - 24V power supply is required. Digital Input and High Quality Audio Performance:By means of dedicated PCB layout design and engineers' attentive debugging, this mid-power audio amplifier board features such high audio performance that you can get pure enjoy of the music, whose reaches 102dB and +N performs well as 0.005% @ 4Ohm, 1W, 1kHz. This amplifier board supports I2S digital input and supports high resolution playback up to 192kHz/24bit so customers can enjoy music same as recorded. Multiple Applications as Audio Amplifier & High-Performance DAC: In addition to speaker output, AA-AB32255 provides analog output without amplification, which means you can use this board as a high performance DAC. One board, multiple applications, which is highly cost-effective. Supporting Power Battery: This audio amplifier can be powered by batteries, greatly improving the portability of the audio system. Thanks to the low power consumption, it features long playback time with battery board (BCPB Series). It is suggested to use BCPB3 / BCPB4 to power this digital audio amplifier. External Volume control: This mid-power amplifier board supports external volume control rotary potentiometer board (AA-AB41152). You can adjust vol through the potentiometer board. Please note that program is needed to be burned for use with TAS5754 / TAS5756. Therefore, the potentiometers in series can not be used with this audio amplifier board. High Reliability and Long Service Time: Excellent heat dissipation eliminates the requirement of an extra heatsink and increases its reliability. Full protection circuit, like over temperature protection, overcurrent protection, over / under voltage protection, is equipped on this board for high reliability and long service time. Output Power 30W@ 4Ohm 19V DC +N 10% High Performance DAC I2S Input Supported 3-Wire Digital Input (No MCLK Required) 44.1kHz-48kHz Sample Rate 16Bit/24Bit Resolution Colour:Black Material:PC+Metal Package Contents: 1 x Amplifier Board(Due to different product batches, the appearance , which does not affect the use) Only 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 +/- 1-3cm.