The MuxLab Audio Zone Amplifier is a Class D digital amplifier that allows one (1) analog source to be distributed to a pair of 20W per channel stereo speakers within a zone. The Audio Zone Amplifier can be cascaded infinitely across multiple zones to give a multi-room audio solution. The Audio Zone Amplifier features two (2) stereo analog audio input lines, microphone input with 48V phantom supply, and two (2) 20W, 4-ohm speaker outputs or one (1) 40W, 8-ohm speaker output.