"MD" wrote in message
...
Arny Krueger wrote:

The problem I have with your proposed solution is more generalized. It is
generally agreed that acoustical problems like standing waves are better
addressed in the acoustical domain. For example, an equalizer is a
potential solution for acoustical modes that create peaks, but it is
going to be a lot less sucessful addressing deep nulls.

So, if you've got problems with room modes, I'd be more comfortable if
you were adressing them with products like these:

http://www.realtraps.com/

I don't like analog EQs because their center freq and bandwidth are fixed
and rarely coincide exactly with the center freq (and assoc bandwidth) of
the peaks and nulls one actually has in their room.

Say what? I have a shelf full of analog parametric equalizers (mostly Rane
PE15) that have continuously adjustable bandwith and frequencies. Perhaps
you are talking about graphic eqs?

For instance I have peaks at 48, 68 and 130 hz - but a null at 52hz. Ana
analog EQ would not be able to deal with this unless in had a huge amount
of narrow bands

Well, you'd need 4 bands. PE15 have 5 bands, and the newer sequel product
the PE17 has 6 bands. Slam dunk! ;-)


Passive room treatment for this (not reflections) seems also very
problematic to me because it's more indiscriminate than the analog EQ.

Say what?

When you apply eq via electronics in the signal path to the speaker, you
change the sound everyplace in the room. When you use acoustical treatments
the effects tend to be more localized to problems in the part of the room
where you apply the treatment.

It will absorb anything in it's range (maybe not linearly) and absorb the
nulls as well.

Not at all. There are acoustic treatments called "Bass traps" that work over
a narrow band of frequencies.