This is a high performance line of amps designed exclusively for the touring and live sound professional. With PowerWave technology, PowerLight 2 amplifiers take your sound to a whole new level. Not only does it give you tighter bass and clean transparent highs, PowerWave also cuts waste heat, boosts reliability and gets rid of unwanted noise and hum. PowerWave is a revolutionary switching power supply technology that provides ample current to the audio power circuitry by charging the supply rails 230,000 times a second through an ultra-low impedance circuit. So unlike amplifiers that use conventional supplies, the audio signal is never starved prematurely and remains crisp and clean. Through continued improvement and innovation, QSC's new PowerLight 2 offer features not found in any other professional audio amplifier. Increased airflow for improved thermal performanceDataPort for remote computer control or the addition of external DSP modulesDetented gain controls with 1 dB steps for precise calibrationRemovable knobs with lock-out security plate prevents unauthorized tamperingUser defeatable clip limiters and selectable low-frequency filter (5, 30, or 50 Hz)1/4" TRS, XLR, and 3-pin detachable terminal block input connectors