Guys don’t get me wrong, I didn't mention anything about the quality of the A/B amps, rather my concern was about efficiency … in my HT room I have a Pj … 12 pot lights.. an amp & ext amp … computer… pvr… amps in my seats for speakers & butt kicker… sub… 2 powered speakers .. analog powered mixer.. everything produces a ton of heat and can get unconfortable very quick espcially in the summer, so I'm always looking ways to reduce the heat.. like the pot lights with led’s.. that’s why I was talking about d class amps, they produce very little heat and are not as heavy as the A/B's because they have no heatsinks..