KenazFilan Posted May 6, 2017 Share Posted May 6, 2017 I put titanium midrange diaphragms in my Forte Is a while back. While I liked the added detail and separation, I noted some fuzziness and harshness in many recordings. Finally I decided to try the band pass filter which Bob Crites designed to deal with the titanium midrange's higher range. (The phenolic midrange rolls off before the tweeter kicks in: the titanium keeps going for a few hundred hz more). I ordered the boards, inductor coils and capacitors from Parts Express: I already had some solder and a soldering gun from my last project, recapping a pair of DLKs. Arranging the caps and coils was not difficult: I even managed to solder the point-to-point wiring without burning anything down. Crimping the end connectors on was actually the most difficult part: I've got a stripper/clipper/crimper combined tool which resulted in multiple terminators being insufficiently crimped and sliding off. But at last I got everything together and installed them between the squawker and the crossover. The results were impressive: gone was the distortion I had noted before and in its place was crystalline clarity. If you are thinking about adding titanium midranges I would definitely recommend building this filter and installing it. If I can do it so can you, and it's definitely worth the effort. Quote Link to comment Share on other sites More sharing options...
absolve2525 Posted May 6, 2017 Share Posted May 6, 2017 Do you have any pictures or parts list? I'm definitely interested! 1 Quote Link to comment Share on other sites More sharing options...
KenazFilan Posted May 6, 2017 Author Share Posted May 6, 2017 The link in the OP has the parts list: each filter uses a 4 mH inductor coil, a 500 uH inductor coil and a 1.5uF capacitor: you'll also need a large hole perforated crossover board, wiring, crimp connected terminals (2 female terminals and two fork terminals), solder and a soldering iron. It took me about 30 minutes to put them together and a few minutes more to install them between the crossover and the midrange driver. Quote Link to comment Share on other sites More sharing options...
absolve2525 Posted May 6, 2017 Share Posted May 6, 2017 Sweet! Sounds like a fun project. What gauge wire did you pick for the two inductors? Quote Link to comment Share on other sites More sharing options...
KenazFilan Posted May 6, 2017 Author Share Posted May 6, 2017 These are the parts I used: Dayton Audio 4.0 mH 18AWG solid core inductor Dayton Audio 0.5mH 18AWG perfect layer inductor Dayton Audio PMPC 1.5uf 250v Precision Audio Capacitor Blue Perforated Large Hole Crossover Board 5x7 (pair) I am not sure I used exactly the right parts but it sounds fine so I'm not arguing. Going forward I might use an air core inductor instead of a solid core as I've gathered some audiophiles think the iron leads to distortion. (If it does I can't hear it: the sound is much better than without them). 1 Quote Link to comment Share on other sites More sharing options...
absolve2525 Posted May 8, 2017 Share Posted May 8, 2017 Thanks for the parts listed! That's very helpful. I will definitely be trying these when I get my Chorus II back out of storage. Quote Link to comment Share on other sites More sharing options...
mark1101 Posted May 8, 2017 Share Posted May 8, 2017 I believe this would be a low pass filter. Quote Link to comment Share on other sites More sharing options...
KenazFilan Posted May 9, 2017 Author Share Posted May 9, 2017 You're right: it passes everything below a certain frequency, not everything above it. My bad. Quote Link to comment Share on other sites More sharing options...
KenazFilan Posted May 9, 2017 Author Share Posted May 9, 2017 You're in Athens? I went to school at UGa for a couple years. Some guys leave their heart in San Francisco: I left a big chunk of my liver in Athens, Georgia. Quote Link to comment Share on other sites More sharing options...
mark1101 Posted May 9, 2017 Share Posted May 9, 2017 Athens is a great place. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.