Model:AK-730 Performance indicators output power:3?00W 8ohm /3?50W 4ohm Frequency Response:20Hz-20KHz?dB Output Signal Strength:250mv SNR:>85dB Distortion: <0.01% Acoustical adjustments:Bass 100Hz ?dB Treble 10KHz ?dB Use voltage: ~220V/50-60Hz Power Loss: 400W Height譝idth譊epth: 145?30?80 (mm) Weight:18.5kg