AMP-D20BR CLASS D BLUETOOTH AMPLIFIER 20W + 20W MCLELLAND AMPD20 MCLELLAND AMP-D20BREfficient Class D design occupies little space and requires no ventilation, yet provides 20W RMS x 2CH output. It accepts two line level sources, with the internal Bluetooth receiver acting as the third input. Switchable limiter provides protection against being over driven in permanent installations. Switchable loudness control greatlyimproves overall sound quality when played at a low levels in office or home environments. 9 pin serial interface