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About this item 6 Mic & 2 Aux Inputs Preamplifier and Line Output for connecting to a Booster Amplifier and for recording the programme Line Input for connecting the output from any external mixer or permitting SSA-250 to be used as a Booster Power Amplifier. Resettable circuit breaker for protection against overload and short circuit. Instant transfer to DC power (Car Battery) if AC power fails. Frequency Response: 50-15,000Hz ±3dB