markografx Posted January 24, 2003 Share Posted January 24, 2003 Hey all- I have a torn passive radiator on one of my forte II's, and parts just told me today that they no longer have any. Any suggestions? Thanks for your help Mark Pedersen Quote Link to comment Share on other sites More sharing options...
WMcD Posted January 24, 2003 Share Posted January 24, 2003 I'm a little surprise they didn't offer more help in view of the circumstances. Call 1-800-KLIPSCH and ask for Trey Cannon. He is very good. I recall that passive or "drone" radiators have their own specific Fs which is going to be necessary to match. That is based on its mass and compliance. There should also be a mechanical Q which might not be quite as difficult to match, but that is a guess. Essentially, the drone is a bass speaker with no magnet or voice coil. It might be that a shop which does reconeing can find a replacement diaphragm. I looked at Parts Express. They have some Peerless drones, but no 15 inchers. It may be possible to patch the one you have. Or a repair shop might do it for you. But first, talk to Trey. Let us all know what he says. Gil Quote Link to comment Share on other sites More sharing options...
TBrennan Posted January 24, 2003 Share Posted January 24, 2003 Mark---Simple repair. Just glue the tear together using tissue paper as a "backup strip". Use Elmer's Glue or rubber cement. This repair should not effect the sound at all, the mass difference is negligable. Quote Link to comment Share on other sites More sharing options...
WMcD Posted January 24, 2003 Share Posted January 24, 2003 Yeah, I was thinking along the same lines as Tom B. Some years ago, make that decades ago, I patched a woofer using Duco cement and some tissue. It makes sense to me to use some reinforcement on both sides of the diaphragm. So you should take it out of the box to allow work on both sides. I'd use some sort of lightweight cloth, like silk or rayon. Also, I'd start with the classic liquid super glue (liquid, rather than paste type). It should penetrate well and then take a little while to solidify. Make sure the superglue doesn't disolve the fabric, first, on a test piece. It take a bit of care to smooth down the material in place while the glue sets up. You'll have to be careful to not get your finger stuck. Using the rounded end of a paper clip might help as a tool. As you can appreciate, the tear is creating an air leak which defeats the function of the sealed bass box. When you put it back together, you can test. Push the front woofer inwards, gently. The back passive should move outwards. If the tear extends to the rim and the "surround" this sort of patch may be more difficult, or impossible. Gil Quote Link to comment Share on other sites More sharing options...
jerohm Posted January 25, 2003 Share Posted January 25, 2003 I recently purchased a pair as an 'insurance' policy (for the 2 pairs of Forte II's that I have. I am willing to part with one if you are interested. Send me an email (preferred)/private message if you are interested. j Quote Link to comment Share on other sites More sharing options...
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