Some SPL meters are not linear throughout the audible frequency range. You may be tuning things for too much bass, based on the inaccuracy of the measurement scale.
Here's an example of correction factors for one of the more popular SPL meters:
http://forum.audiogon.com/cgi-bin/fr.pl?htech&983682086&openflup&1&4
Lee
I've been driving myself crazy tonight with a Stereophile test disc and my spl meter. I have done sweeps from 20 to 200 hz
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