I just modded a set of bookshelf speakers. (Yamaha NS-A635A) The midranges were blown. I remembered having a box of old drivers in the basement. (I used to work at Radio Shack when I was in school and would buy disco drivers for pennies on the dollar.) I found a pair of cloth dome mids that fit the existing hole in the enclosure. I put then in and they were so much more sensitive than what they replaced that the cabs became quite "honky". So I replaced the existing tweeters with a pair of "linaeum" tweeters mounted on top of the cabs. I left the old tweeters in the cabs but disconnected the wires to them (just to plug the baffle holes). I really like the sound of this setup for the most part. The speakers sound much more articulate than they did before. However, there is still too much midrange. The cabs didn't have a proper crossover network, just high pass caps. I was told that this is all that is necessary, but I have my doubts. I am wondering if the frequency response on the 8" woofer goes high enough that it is playing some of the same frequencies as the mid, adding the peak that I hear. Would a proper 3 way network possibly (or even likely) help with this midrange problem? If I should add a crossover, that leads to question two. The add on linaeum tweeter is self enclosed, with terminals on the back and a high pass cap built in. If I add a crossover, will I need to bypass the enclosed cap? I didn't know if capacitance is additive, like resistance, or if having the second cap will only block the same low frequencies that the crossover is already handling. If it were easily accessible, i would remove it either way, but if I can avoid tearing this thing apart and not getting it back together that would be great. Thank you in advance for any help.