The Crown OC-150 is a rugged, high-performance amplifier built with the reliability and power that made Crown legendary. An overbuilt, passive Output Control Center introduced in 1973, was designed as a premium, studio-grade companion to complement high-power vintage amplifiers like your Crown DC-300 or Phase Linear 400. Because vintage power amplifiers of this era completely lacked front-panel headphone jacks, speaker selector buttons, or visual output meters, the OC-150 was built to sit in your equipment rack and safely manage those high-power signals.