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I was unable to get the input volume higher than -22dB during actual measurements
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Use a more sensitive scale on the meter (as long as it doesn't clip during the measure - don't get so sensitive as to peg the needle).
Or you can measure at 80dB to increase the input level.
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The measured -3dB according to JBL of my sub is 25Hz, but my graphs are way worse than that?
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Do a near field measurement with the sub in the middle of the room to check the actual speakers response with minimal room influence.
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How 'bad' do these actually appear?
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Are they filtered responses or are they raw?
BTW, if you want your filters to be sequencial, there is a "sort" button on the filter pop-up screen.
Overall the response looks great for a sub with a cutiff around 35Hz.
It's nice to see at least one raw measure to evaluate better.
brucek