The CM-5.5/7.5/10.5/15.5/20.5 are dual-channel concert-grade amplifiers. Their low profile and exceptional sound quality make them ideal for permanent installation in professional PA systems or for road use in live performances. Inputs are XLR/TRS "Combo" connectors, and outputs are via rugged five-way binding posts or Speakon® connectors. Multiple amplifiers may be linked together via XLR connectors on each input. All units have soft-start protection circuitry and feature signal protection and clip indicators on the front panel. For added versatility, they may be operated in stereo, dual mono or bridged mono mode. Variable-speed fans provide low-noise ventilation. The CM-series amplifiers are powered by 100-120VAC or 220-240VAC@50/60Hz (depending on country requirements) and are packaged in 3.5" (2RU) or 5.25” (3RU) high rack mount enclosures.