Hi,

"Don Pearce" wrote in message
...

Don't bother with room eq - it doesn't work, and it can't work for
very good reasons. Rooms are not unflat because of "frequency
response"; they are unflat because of standing waves or modes. The big
feature of these is that the response you measure at one point in the
room is totally different a couple of inches away.

Thanks Don. I wasn't planning to use it to EQ the room, just as a
blunt instrument to identify the problems; a sort of analysis tool. I'm
aware that EQ is not the solution.

Try this test - play a constant tone at 150Hz or so on your system,
and walk around the room. What happens? Now, think - how would you
equalise that?

Since you ask, I'd buy a dentist's chair and strap my head down. It might
just work up to about 2kHz :-)

The measures you are already taking are absolutely the right ones. The
more irregular you can make the surfaces the better.

That's a big chunk of the problem - smooth walls. I'm going to try
big book shelves on as much of the walls as possible.

Once you have
that right, play with the reverberation with soft furnishings. Thick
rugs in front of the speakers are always good. If you have poor
imaging, put some on the walls beside the speakers too.

It's an odd room; the imaging is ok, even though the room geometry
seems to suggest it shouldn't be. The problems I have are somewhere
in the bass region. My best guess is that this is due to the room
having a kind of mezzanine leading off it, about 3.5m deep, over an
adjacent room, which is leading to weird behaviour at (vaguely)
50 and 100 Hz.

Thanks for the feedback.

Regards,

Glenn.