If I were going to use active XO with the MD2001, I would probably add a tweeter to help the HF. The tweeter would be high passed where the MD2001 rolled off, and padded down(if needed). This way I could use a very low-powered tubeamp for the very efficient HF-section.I would like to make it clear that I don't have any experience with active XO's, an this is only thoughts I have.

I'll probably end up with a passive solution and a tubeamp with maybe 40-60W. I'm going to try a Kora Jupiter (60W) as soon as my dealer gets it in stock.