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Trevor wrote: "
Yes it depends FAR more on speaker efficiency. However given 2 speakers
both with the same efficiency, usually rated at SPL out for 2.83V input,
(1W into 8ohm) then the 4ohm speaker, NOT the 8ohm one will sound louder
at the same volume control setting, assuming the amplifier is capable of
handling the current. And there's the rub with cheap amps these days.
They are often rated for 6ohm+ speakers because they have limited
current capability for their maximum voltage output. So yes everything
is fine at low volume, but not when near maximum levels. "

THANK YOU Trevor for that clarification. That's
what I figured. Cheap pussy amps in today's
consumer audio equipment, thus a proliferation
of lower, and odd-numbered impedances listed
on the backs of speakers. Notice I'm keeping the
discussion HOME stereo related and not auto,
so we are comparing appoles to apples here.

But I must ask: What factors, most critically,
drive speaker efficiency?