The CX-902 2-Channel Direct Output Power Amplifier from QSC is a 2-channel, low-impedance 550W output amplifier. It features PowerLight switch-mode power supply technology for high performance and has an integrated security cover designed for tamper-proof installations. This unit has a variable-speed fan to maintain low noise, and 1 dB detented gain controls for fast and accurate gain settings. The active inrush limiting is designed to eliminate AC inrush current, and a class-H complementary bipolar output circuitry is integrated for high efficiency.