UNIBEX model SPA-6000 has been designed for both tabletop use and 19" rack mounting. SPA-6000 is highly reliable 600 watts PA Booster Amplifier. It is designed to give high power clean sound and trouble free operation under extreme climatic conditions.FEATURES:* Line Input 200mV/1V switchable for connecting a mixer or another amplifier. * Resettable circuit breaker for protection against overload and short circuit. * Instant transfer to DC power (Car Battery) if AC power fails. * Box Speaker/Driver Unit selector switch. Bass boost defeated at Driver Unit position for safer operation of driver units. * Ideal for large installations where a high power output is required. A combination of a SSA-5000EM and one SPA-6000 can deliver 1100W power output.