High Power PA Amplifiers    SPA-4000 400 WATTS AC & 36V DC Operation UNIBEX model SPA-4000 has been designed for both tabletop use and 19” rack mounting. SPA-4000 is highly reliable 400 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-4000 can deliver 900W power output. SPECIFICATIONS POWER OUTPUT 525W RMS Max., 400W RMS at 10% THD 3100W RMS at 5% THD, 200W RMS at 2% THD OUTPUT REGULATION 2 dB, no load to full load at 1kHz INPUT CHANNELS 1 × Line 200mV/100k 1 × Line 1V/50k FREQUENCY RESPONSE Speaker Position       : 50-15,000Hz ±3dB   Driver Unit Position  : 200Hz-16KHz±3dB SIGNAL TO NOISE RATIO 60dB TONE CONTROLS Bass±8dB at 100Hz, Mid±8dB at1KHz, Treble±8dB at10KHz SPEAKER OUTPUTS 4, 8, 70V & 100V POWER SUPPLY AC: 220-240V 50/60Hz DC: 36V (3×12V Car Battery) POWER CONSUMPTION AC: 1000VA DC: 8A DIMENSIONS W482 × H133 × D390 mm WEIGHT 21.0kg