Upgrading DM2

Hi,

I have just aquired some B&W DM2's

NOT a big fan of B&W, but these just really rock.

I think they are a little clouded in the upper midrange, but the deep bass makes up for it.

Now i have had a look at the filters. They MUST be upgradable.

I can't imagine being the first, but a search here has resulted in nothing.

Does anybody know a thread or a site for me?

regards

Bas