This is some more info about SpectaLAB.
http://www.pmgrp.com/prod01.htm
It's one of the four versions that is available. It's also the most complete one and quite solid software.
Anyways,
First point
I understand that using pink noise can give interference at other frequencies, a sweep is just 1 frequency. So you may be right at that.
Second point.
I use a mic, not a SPL meter.
But I understand that in that case, no correction is applied. Through?
Third point.
Do you have the option (somewere in the software or registry) to change the start frequency? Otherwise, this may be something for the next version?
Quote:
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I would suggest that if your measured response is not at least fairly close to the predicted response, then you may not be entering the filters correctly or your mic may not be stationary between measurements... or something else it going on.
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What I've done is moving the sub around in the room for a obtimal location. It seems that turning the sub 180 degrees, improves the respons enourmously. Now I have a flatter point to start from. I've noticed that the predicted respons is better now.
The only thing that's left is phase respons. This could be good info to get your subwoofer alligned with the main speakers. Applying filters also change the phase, so some more info on this could be handy.
Thanks for your answers so far.
Bart