On Tue, 1 Mar 2005 18:43:37 -0500, "Arny Krueger"
wrote:

Cmon Arny, my current living room is roughly 11 by 5 meters. my
Maggies have resp. 84 and 86 dB/w/m efficiency and I'm quite happy
with the SPL derived from a mere 20 Veff amplifier.

Is there a formal defintion of "quite happy" in terms of of SPL levels?

Yes. It's the opposite of "quite unhappy".

In other words, if it does the job without causing complaint, then the
SPL levels are appropriate.

Seems pretty simple really.