Fast-switching 3 audio inputs: dual-mono RCA (Input 1), 3.5mm stereo (Input 2), TOSLINK digital optical (Input 3) Mono 40W amplifier output switchable between 70V and 100V distributed speaker systems 3-level MIC input — supports condenser (48V phantom), dynamic, and wireless/line microphone types MIC port supports balanced and unbalanced signals with effective external noise suppression Ducking function — auto-attenuates line audio when MIC signal is detected; recovers after 5 seconds of silence 16 addressable ID codes (0–F hex) for RS232 multi-unit control loops Volume, Bass, and Treble independently adjustable via front panel buttons, IR remote, and RS232 Stereo line audio output for daisy-chain feed to additional zone amplifiers or recorders RS232 control via 3-pole captive screw connector (9600 baud, 8N1) ID loop pass-through for multi-unit RS232 chaining IR remote and external IR receiver support 48V phantom power for condenser microphone supply Dual-mono output capability LED indicators for power and input selection status Convection cooled, antistatic case design Locking DC power connector (24V DC adapter included) CE, FCC, UL certified