On Demo Now! Click Here to Book an In-Store Demo! Available for In-Store Shopping Only Power Guard - McIntosh designed and patented circuit that prevents speaker clipping. Photo-optics react in 1/1000th of a second to regulate power levels to speaker, protecting the speakers and the amplifier. A waveform comparison circuit continuously monitors both input and output signals. Power Guard dynamically adjusts the input level to avoid clipping while preventing harsh sounding distortion. Output Autoformer - Unique McIntosh technology delivers the full rated amplifier output with the least possible distortion into loudspeaker impedances of 2, 4, or 8 Ohms; you get all the power you paid for and the freedom to choose any loudspeaker. Output Per Channel 150W Number of Channels 2 Speaker Impedance 2 or 4 or 8 Ohms Rated Power Band 20Hz - 20kHz Total Harmonic Distortion 0.005% Dynamic Headroom 2.0dB Frequency Response +0, -0.25dB from 20Hz to 20kHz +0, -3.0dB from 10Hz to 100kHz Damping Factor >40 Wideband Dimensions (WxHxD) 17 1/2" (44.45cm) x 6" (15.24cm) x 21" (50.8cm) - including front panel, and cables Weight 75lbs (34kg)