Quote Originally Posted by MartinT View Post
I've decided that I will refoam the midrange drivers at some point as I feel there is more to come from the midrange.
Have you considered enlarging the rear cavity the mids drive into. That may reduce the boxiness you mentioned.

If I recall that particular driver has a rear 'compartment' of about the volume of two coffee mugs and could do with being larger to avoid the cavity honk. It may also help to very lightly re-dope the cones (with Aleene's and a drop of water), bearing in mind that this adds a little mass to the cones and will very slightly reduce the driver's sensitivity (maybe usefully).