The Markaudio 7MS has a resonance and a corresponding dip in the response at 460 Hz.
Then I had this idea that I might be able to fill that dip with a cleverly tuned port with its port resonance at the same frequency...
Is filling in a resonance with another resonance a really bad idea or a clever one?
Then I had this idea that I might be able to fill that dip with a cleverly tuned port with its port resonance at the same frequency...
Is filling in a resonance with another resonance a really bad idea or a clever one?
Hmm, a band stop filter damps a resonance, but don't know how to invert it to add a resonance without some pressure source, so looking forward to what you come up with before I'd have a clue whether clever or 'fool's errand'. 
One minimum phase resonance can fill in another, just as an equaliser could do the job. However the port length resonance may not quite be there. I'm sure it could help, but I don't know how much.
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That is an unfortunate consequence of the mono-suspension. The “dips” (not really the right word given the Q). Q is very high and unlikely to be heard. The same in A5.3 is smaller, it is larger in the A11ms, so i would suggest that the size and depth of the resonance is dependent on driver size.
No one has complained about the one in A11ms, it is the largest. I have the graohs ready to illustrate but need to get downstairs and relight my PhotoShop machine. The dip in the A5.3 is small enuff it cannot be identified. Givn that its small size means the cone does not have to bend back on itself to reach theh surround, that could ba a difference. And teh shape is more dramatic in the larger cones.
dave