The Peavey CS Series Amplifiers are the global standard bearer for workhorse reliability. These rackmount amps benefit from Peavey's most popular audio innovations, including exclusive DDT compression/anticlipping protection. The CS 4000 circuitry protects against shorts, improper loads, abrupt turn-on levels, high temperatures, and subsonic frequencies that could damage loudspeakers. All CS power amps include toroidal power transistors for lighter weight and increased power.