I agree with Eagle, fuse and tweeter attenuator bypass is a HUGE improvement- albeit with a risk. I am planning a no holds bars cross over in the next few months, from everything I am told the cross overs are the true weak link with these speakers. For other magnepan users I strongly urge you to try the Jena Labs cables, they are really something amazing(in particular for the money). I have had a lot of cables including- cardas golden cross and golden reference, nordost Valhalla, kharma grand enigma cables, tekline(I don't recall the model #, but it was there flagship), Zu WAX among many many others, and the Jena's put all of them to shame. The closest runner up was the Valhalla and they are fairly close but they are a lot more money- and trust me if I felt they were any better I would have them in my system now.