I just added dynamat to the back of the HFI-780 and a little piece on the magnet. Before closing I placed a bit of cotton inside the cups.
The bass is still as deep but it seems better defined and tighter. Perhaps the resonances have been reduced and account for the change. When I lay my hands on the cups they do not vibrate as much as before. The mids/treble seems to be more prominent or perhaps I should say less subdue.
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