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troubleshooting low frequency drop in spl

Subwoofers, Bass, and Transducers - www.avsforum.com
I initially posted this in REW thread but though I may get better input from the subwoofer folks.

I was doing some testing after re-running Audyssey using the app rather than the AVR and for the second time ran into an issue I could not figure out. I ran a sweep of subs only. Audyssey reference with trims at default and DEQ, dynamic volume off. I used the LFE channel. I then was playing around a bit with crossovers and sub distance playing through center channel. I noticed that at the lower end of the frequency response I was seeing up to a 5db drop compared with my initial sweeps just 20 min earlier. The spl difference increases as the frequency decreases. I made sure I put all settings back to how I had them for initial sweeps and went back to just the LFE channel but couldn't duplicate initial FR sweeps. I am attaching a graph of what I mean. Red is what initial sweeps looked like and blue is what I noticed about 20 min later. These are both sweeps with identical calibration, settings, master volume, mic position, etc. I could not get it to look like the initial sweeps. I had a very similar issue several months ago testing my prior dual subs which were SVS PC-12+. Current are PC-4000. So doesn't seem to be a sub issue. Also of note subs are both run wireless on independent sub outs. I'm not sure how to trouble shoot and if it's a measurement issue or a real issue. It sort of looks like I had DEQ on initially and then off but that's not the case. Thanks for any input.


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