Active filter for B&W matrix 800


Hello everyone,
I own a great pair of B&W matrix 800's and have read and found that the best way to get everything out of them is to take out the passive filter from the bass, and biamp the speakers with active filtering on the bass.
Krell made the KBX especially for this but it is either unfindable or super expensive...
Anyone has experience with making these speakers active with a "normal" and "affordable" active filter, which brand, model would you recommend?
blueskywalker
JPS are probably the only ones around to make what you ant. They may make a custom pair for your situation.
Thx for the reply, could you be a bit more specific please? A google on JPS did not bring me very far ... I live in Europe, are there dealers for JPS products here?
Anyone else who has activated his B&W matrix 800's want to share tips?
Google "AudioFX". It's a store here in town that has a pair on display. I'm sure the owner(Chris)would be glad to offer some tips. Tell him Howard referred you.