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I would appreciate any thoughts that you may have
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I'm kinda lost. Your initial post indicates that when you measure twice with no changes, you get two completely different results.
Your last post isn't consistent with the inital post at all?
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I have moved the sub around and still get that dip in my listening position, which cannot parctically be changed.
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Then you are stuck with it. Trying to make massive cuts isn't the answer. You end up with no signal. The answer is to filter the peaks within reason and leave the rest alone. Keep any gain to a minimum.
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is sweep the most accurate? The results seem to vary quite a bit for the different tone types, e.g. 1/6 oct versus sweep
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Use the sweep. It's the most accurate. The next version of REW won't even include the manual or auto octave tests.
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Could the inconsistency be due to filter 2, i.e. having a cut over a large bandwidth (40)? Filter 2 (sometimes) has a very positive effect on the curve as a whole with the large bandwidth.
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You can have any filter with any size bandwidth you want. You can have them all at the same frequency if you want. No problem. There is no such thing as inconsistency. It either works or it doesn't because there's a fault or a error in the inputting of the filter.
brucek