channels in the same size as a Zamp v.3 50 watts RMS x 4 @ 8 Ω, all channels driven 90 watts RMS x 4 @ 4 Ω, all channels driven Class AB input stage plus premium Class D power stage Speaker level input for integration with any stereo receiver, even w/o pre outs jacks Bus for looping Zone 1 to Zone 2 Ultra-sensitive audio trigger for automatic turn on 12v trigger input for automatic turn on Powered 12v output to trigger other devices Loop output for sending audio to another amplifier Level controls for each channel Detachable phoenix style speaker connectors Unique half-rack width chassis; 1 rack space high