AMPLIFER,40W,2 INPTS 1 P/LEVEL40 Watts of output power 2 Inputs on Model CC4021: 1 balanced MIC Line; 1 unbalanced AUX Individual phantom power for MIC inputs Volume controls for each input Input 1 can mute other inputs Audio activated muting Defeatable muting Bass and treble controls Compatible with 70V, 25V, 4 ohm,and 8 ohm systems REC Output Peak indicator Signal indicator External 24V DC supply input Listed to UL Standard 60065for US and Canada Optional rack mount adapter