ADAU1701 2.1 4.0 DSP Digital Signal Processing Preamp Crossover 2-in 4-Out Tone Board with Treble Bass Volume Adjustment Support Sigmastudio

2 x in, 3 x Out Digital Signal Processor Extension Board for DSP

Audio Digital Signal Processor DSP Kernal Board - ADAU1701 Adjust The gain, Cut-Off Frequency of bass and Treble