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One should not have to apply more than one filter to correct a resonance at one frequency if the room is doing its job! My belief is if you have to apply multiple filters for a narrow frequency spike or bump, it's the room or a very poorly designed sub driver or enclosure "ringing". Granted it still has to be corrected for the system to sound "right" but not multiple filters.
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My degree is in EE not acoustics as well - but even if you design a room you cannot guarentee not getting multiple modes at one frequency or a narrow band because rooms are never perfectly square nor built to precise dimensions. Higher order modes are dense & sensitive to small differences in planned and actual construction.
You don't need multiple filters to correct - you can just put a big notch in for low frequencies if you want.