Dynatech PowerDrive Series Power Amplifiers deliver from 300 Watts to 5000 Watts of power in two to three rack spaces. Built around robust and advanced toroidal transformers, they deliver clean power on demand. The advanced protection circuitry guards against short circuit and open circuit, and also protects against ultrasonic and RF interference. A high current power supply increases reliability and performance. Other features include center-dented gain controls, input peak limiter, and fast recovery to ensure low distortion. The variable speed fans effectively cool the amp and protect against overheating. Input is through XLR connectors, while you can use Speakon-type or binding post connectors for output. The PowerDrive Series Power Amplifiers have selectable low pass and high pass filters at variable frequencies. Dynatech Power Drive Amplifiers are specially designed for professionals who value high power, audio clarity and lasting performance.