Yamaha Natural Sound HiFi Amplifier A-S501

Minimum RMS Output Power (8 ohms, 20 Hz-20 kHz) - 85W + 85W (0.019% THD)

Maximum Power (4 ohms, 1kHz, 0.7% THD) - 120 W + 120 W

High Dynamic Power/Channel (8/6/4/2 ohms) - 130/150/185/220 W

Frequency Response - 10 Hz-100 kHz +/-1.0 dB

Dimensions (W x H x D) - 435 x 151 x 387 mm; 17-1/8” x 6

Weight - 10.3 kg