... , class D AMP module, digital AMP board 1. Introduce SL-A09-HIFI is the new ... High End class D design, it is new product of digital amplifier board, use SMT decal of main IC, connection is ... =10%) High efficiency: Up to 90% Filterless class D amplifier Programmable gain(+22dB, +29.5dB, +36dB) High PSRR(90dB at 1kHz ...