Ethan Winer wrote:

Not smoke and mirrors, acoustic interference. That's the real issue. And
that's why even 1/12th octave pink noise tests are useless to obtain a true
response within a room.

Bbuut ... "true response" as measured at any fixed location does not
apply for human beings because they do not ever stay at a fixed
location, they move around.

The quarter octave smoothened (based on eight octave measurement) that I
proposed on a previous version of my site has a much better correlation
to how things actually sound and overlooks stray and irrelevant
reflections from furniture and whatever.

Reflections that directly influence imaging are of course not "stray and
irrelevant", but if you want to measure the bass response of a
loudspeaker in a bookshelf, i. e. with lots of objects nearby then it
appears to me that there is no other way to do it than using a way of
measuring that is not clouded by statistical noise.

None of us live inside a anechoic chamber

Yes, but that's an entirely different issue. You said your stated goal is to
measure the *speaker's* response. Well, if you meausre it in a room you're
measuring far more of the *room's* response.

For measurements to be a useful aid in system alignement they should
correlate to the listernes experience of sonic balance. Narrow band
combfilter images tend to confuse rather than guide, it seems to me that
they focus on the room and omits the loudspeaker and the listeners
experienced impression thereof.

--Ethan


Kind regards

Peter Larsen

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