The crest Audio CA9 from Behringer is a professional-quality rack mount stereo power amplifier designed for installed applications. The rugged all-steel chassis houses a high-current toroidal transformer and Toshiba/Fairchild power transistors for rock-solid reliability and an ultra-high transient response.The rear panel of the unit has both XLR and 1/4" inputs, and Speak-on and Binding Post outputs, allowing you to connect to virtually any sound system. The system has rear-to-front ventilation to keep the components cool. Protection circuitry protects the unit against overheating and DC overload.The amplifier also has independent limiters to prevent distortion, front-panel gain controls for each channel, selectable LF filters to reduce hum, and LED lights for monitoring power, signal, and clip status.