Anyone build a speaker using the heil tweeter?

Yes I have and I'm glad I did. Heil amt1's with 6" Peerless in acoustic reflex cabinets; Bass handled by a sub-woofer with twin Kef bass speakers. Don't replace the 10" driver, just couple the Heil with a good mid or mid-bass in an appropriate cabinet. Because this was an exercise in minimum cost, I used the original crossovers from the ESS speakers. I thought I would try them first to see if it would work and they did. The crossovers have an attenuator for the Heil and I did have to dampen it down to match the Peerless. This system sounds far superior to the old ESS speaker configuration. I think it sounds just fine. The sub crosses over at 100.

I just ordered a pair of SEAS 8" mid-woofers, to try as replacements for the original drivers. I will be retrofitting them as soon as they come. I am also using a powered sub, which has made a great improvement. If the SEAS don't work with the old crossovers, then I'm going to bi-amp the system. Sonny

I mounted the Heils on B & W 804's without regard to the fact that the Heil's are supposed to support bottoms of about 1000 Htz and the 3 ways cross @ 4500. was about to modify the crossover when much to my chagrin the sound was great and superior to the original factory B&W's with my VTL stereo 150 amp and Conrad Johnson Premier preamp.

I believe that the configuration decreased the midrange tweeter cross. I am leaving it and believe that if B & W got off there high horse and teamed up their logs with Heils the result could be astounding. I don't know if I am foolish, but I love my sounnd. I think your rebuilding idea could surprise you. I believe the Heils to be an audio classic complete with a legion of devotees. Good luck.