Digital amplifier module, class D AMP module, digital AMP board 1. ... End class D design, it is new product of digital amplifier board, use SMT decal of main IC, connection is very ... ohmTHD=10%) High efficiency: Up to 90% Filterless class D amplifier Programmable gain(+22dB, +29.5dB, +36dB) High PSRR(90dB ... dimension is only 48mm*72.4mm with heatsink make more powerfull and can be work for long time