I was only pointing out that what is specified/claimed in the manuals does not seem to add up. As well as being grossly different from each Manuf. Thanks for pointing me to your "ACD" article which I did read back in October but obviously need to polish up on. I do realize that 90% is the absolute best efficiency you can get coming from a switching D-class amp. However I don't believe that any of these 3 use that technology.
Thanks I don't want to get off topic.
"I would have written less but I didn't have the time."