i just replaced the cabinets of my klipsch RB5 monitors. after i got into the box i was surprised to find very little damping (speaker enclosure material). there was just two pieces of foam, rolled up and stuffed behind the drivers - there was quite a bit of exposed MDF.
Well...while i was putting things back together i decided to 'remedy' the situation. i unrolled the foam and used it to actually line the inside of the cabinet...then i used the packing material (foam like, but not really foam - thin stuff), rolled it up, and stuffed it in behind the drivers - pretty much the way they had it - but it's much more dense.
At any rate...it certainly sounds different...but i don't really understand what i did. it almost seems as if i have lost a little midbass.
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DeanGW