QSC ISA 280

Rear panel gain controls for tamper resistance; 2-dB detents allow for quick and repeatable settings. XLR and detachable Euro-style input connectors DataPort V2 for use with DPV2-compatible signal processing accessories (XC-3, SF-3, LF-3) and DSP-3/DSP-4 (with external power supply). Independent defeatable clip limiters for reduced distortion. Selectable high-pass filters (30 Hz or 70 Hz) protect speakers and prevent speaker transformer saturation with minimal effect on program material. Front panel LED indicators include power, signal, and clip. Covered barrier strip output connectors for safety agency compliance. Automatic on-demand variable-speed fan: quiet normal operation, with maximum cooling when needed. Rear-to-front air flow helps keep equipment racks cool. Stereo, bridge, or parallel operating modes. Comprehensive protection circuitry including DC, infrasonic, thermal overload, and short circuit protection.