Hi Matt,
 MI> DS> The room supposedly has a resonance
 MI> DS> at 250 hz, so the 1/3 band EQ
 MI> DS> has all bands below 50 hz cut,
 MI>
 MI> And this is supposed to help to 250Hz resonance how?
Don't ask me, I'm just reporting what the sound man tells me, and what
I've seen. :)
 MI> UGH!  500 too?  I don't expect
 MI> subharmonics of 500Hz would be THAT much of a
 MI> problem...
Somebody thinks there is a harmonic connection.
 MI> Frankly, I believe the brick would cause
 MI> more mid-high reflection than
That agrees with the echos I'm hearing.
 MI> anything.  250Hz is more in the range of
 MI> room standing waves, I would think.
Agreed, but since I've never heard the room without this EQ I have no
comparison.
 MI> black cloth would deaden the upper end
 MI> nicely.  Put some acoustic wedge foam
 MI> behind the cloth to help break up the standing waves.
Works for me, but I don't make the decisions. This has to be cheaper
and more effective first step, rather than buying a new system from
Apogee, that will still have room problems.
 MI> DS> Another option was to get the Berringer DSP8000 EQ, so the band
 MI> I agree, that's a little extreme... and
 MI> it's only treating the symptom, not
 MI> the problem itself.
The security lockable multiple EQ curves, the feedback filters and the
built in RTA is also part of the decision.
 MI> First thing I would do is get ahold of a
 MI> good RTA (or even a cheap one, in
 MI> this
They have a cheap 10 band RTA, but it isn't hooked up, so the berringer
would be a better choice anyway.
 MI> where to tweak the EQ.  Adjusting speaker
 MI> positioning and placement - for
 MI> example, making sure the speakers are not
 MI> aiming directly at a flat wall at
 MI> right angles to that wall - would help as well.
The speakers are bolted to the ceiling (50 feet up), so repositioning
is a very big job! Two of the mid/high cabinets are aimed at the sides
of the room, which are the brick walls, so that is part of the problem.
 MI> Chances are good someone else has screwed
 MI> with system settings since it was
 MI> installed.  In fact, in my experience,
 MI> these types of systems tend to get
 MI> messed up on a regular basis, usually by
 MI> someone with a tin ear who thinks he
 MI> can compensate for other problems by fiddling with the EQ.
I suspect your right, and that is why the security access to the
settings on the berringer is so appealing, assuming they can get it
set properly again.
 MI> Determining which amps drive which
 MI> speakers (or at least which range) is easy
True, but I haven't had that close of access, I just saw the rack in
the back room, and the crossover has a security plate over it.
... dschmoll@nyx.net (David Schmoll)
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