TRF HE 600.4AB RMS:100WX4CH(4Ω) RMS:150WX4CΗ(2Ω) TOTAL: 600watt rms 4CH TUBE AMPLIFIER MAX:200WX4CH(4Ω) MAX:300WX4CH(2Ω) TOTAL:1200watt  max TEST VOLTAGE&THD:14,4V-1%THD SIGNAL TO NOISE:93dB INPUT SENSITIVITY:0.2v to 6v CROSSOVER:12db oct/slope 4 channel operation4/ channel operationSelectable FULL/HPF crossovers CH4variable HI pass filter:50Hz to 250KHz1x6 gauge power & speaker terminalsFUSE : 2Χ25 AMPER LED power (green) and protect (red) indicator lightsTested voltage & THD: 14,4v &Less than 1% THDWorking voltage :8.5v to 15vDimension : 385x200x57mm