I'm still a little confused on if John really wants to focus on the efficiency of an amplifier when it's not amplifying, which he certainly understands has nothing to do with amp topology and more to do with the power supply and whatever parasitic loads are in the box. But alternately, you can look at pro amplifiers and see that as through the years they transition (and a good part of why they transition) from AB lead sleds to class D, they significantly reduce the included heat sinks and in some cases noticeably shrink in size along with the weight loss. This is because (when amplifying, of course) class D generates significantly less heat per watt output, so you can make do with a lot less extra stuff in the box and the amps still survive. This isn't some conspiracy from Big Heatsink Value Engineering.
