Digital amplifier module, class D AMP module, digital AMP board 1. Introduce SL-A09-HIFI is the new High End class D design, it is ... (8 ohmTHD=10%) High efficiency: Up to 90% Filterless class D amplifier Programmable gain(+22dB, +29.5dB, +36dB) High PSRR(90dB ...