How do I correct frequency drop?

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I've recently moved to a new home and finally have a dedicated listening room to put my system in. The room measures 13'6" x 12' with 8' ceilings. I started with speaker placement along the shorter wall and according to Audio Physics setup. I tweaked from there as I took measurements using Stereophile's Test CD 3 (tracks 17-19) and a RadioShack analog level meter. The speakers were very well behaved for the most part, within +/-3dB across the majority of the range. I used 70dB @ 1kHz as a reference point. On track 17 however, the bass region, there was a significant drop in the mid-upper bass. It dropped almost 10dB from Index 3-4 and then spiked from Index 4-6 on that track. I don't have the exact frequencies with me but I believe it was around 125Hz-70Hz.
Is there anyway to level out this significant dip/spike? Should I start with the speaker placement or listening chair placement? Would any kind of room treatment work without significantly impacting other frequencies?
Thanks in advance,
Bill

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Topic - How do I correct frequency drop? - wgb113 09:17:53 06/12/02 (6)

Re: How do I correct frequency drop? - Davey 21:28:59 06/12/02 (0)

Re: How do I correct frequency drop? - Jon Risch 17:12:45 06/12/02 (4)

Bass Traps - wgb113 04:59:33 06/13/02 (3)

Re: Bass Traps - Jon Risch 10:37:02 06/13/02 (2)

Re: Bass Traps - wgb113 13:00:55 06/13/02 (1)

Re: Bass Traps - Jon Risch 17:30:40 06/13/02 (0)

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