due to it's inherantly higher idle current. My "baby" 60 wpc has only 4 output devices per channel and idles at 6.2 watts dissipation, the "big boy" has 8 and idles at 12.8 watts. I doubt either one is generating AB xover notch distortion at normal listening levels...the devices would have to be driven hard enough to reach cutoff first. Clean, neutral amplification is all I want, being dead silent regarding hum is nice too. And the MAC-240 is still upside down on my workbench, going on a couple of months now, waiting for a "current inrush limiter" to materialize so I can start rebuilding the HV p/s filters :( Sam