30W into 25V/70.7V and 4Ω Loads Rear Mounted DIP Switch Allows Mute Receive for Inputs 2 and 3 Contact Closure Mute Terminals Variable Mute Sensitivity Control for Input 1 Two Unbalanced, Summing Line Level Inputs Balanced Mic/Line/Tel Input w/ Phantom Power Automated Diagnostic System Test (Push Here Diagnostic) Optional Rack Ears AARMK2-5