Posted by Paul W [ 82.46.61.85 ] on August 13, 2008 at 20:30:48:

Today I had a little play with a basic SPL meter and some test tones and was reasonably gratified that the expected room modes were present at the calculate frequencies, so I can work on those. What was a totally unexpected was an -18db hole at 45hz! Any idea what causes this and if anything can be done about it?

The speakers are 7 Pi's and the room is 17.5 x 12.2 x 8.5 (LWH)

To be honest I didn't spend a great deal of time on this (to boring when there's music to listen to) so may have to revisit the exercise again sometime.

Paul W.

Replies:

• Re: In room response - Wayne Parham 00:10:00 08/14/08 (8)
  • Treatment for a cancellation notch? - Paul W 11:30:40 08/14/08 (7)
    • Re: Treatment for a cancellation notch - Multiple subs - Wayne Parham 12:24:18 08/14/08 (6)
      • OK where to start - Paul W 08:30:08 08/16/08 (3)
        • Re: OK where to start - Wayne Parham 12:48:00 08/16/08 (2)
          • Room measurements - Paul W 23:10:48 08/16/08 (1)
            • extended chart 20-300Hz - Paul W 06:58:14 08/17/08 (0)
      • Re: Treatment for a cancellation notch - Multiple subs - Paul W 06:35:08 08/15/08 (1)
        • Re: Treatment for a cancellation notch - Multiple subs - Wayne Parham 12:07:53 08/15/08 (0)