Not that I would call any of those listed brands as High End Class D amplifiers but to each its own.
fixed
Well, actually he never stated those brands as high end, but as SPL.
But what I don't understand, why is everybody nitpicking every little detail about comparing and not actually asking questions about the amps?
Everybody automatically wants to compare but doesn't even know enough about amps to do it.
He stated that they are comparable to other "high end class D amps" (for efficiency).
Then when he expanded on his explanation he said they would compare to the other SPL amps on the market.
It would therefore be reasonable to assume that he considers the two as being one-in-the-same. If not, then which one would he consider them comparable to? Which explanation was
wrong? Because he gave both explanations to answer the same question.
FWIW,
Kevin was the one who brought up the comparisons. When someone asked about the efficiency his response was:
Yes - they are in line with the other high end class D amps currently on the market 
So I guess the better question is why does he rely on trying to compare them to other products on the market (which he has done twice in this thread) rather than explaining the efficiency and benefits of his own amplifier. Apparently part of his sales plan relies on trying to establish what they "compare to" rather than actually explaining the features and benefits of his amplifiers themselves.
Anyways.....I'm mainly here to patiently await his response to M5's question.