Bacek Posted May 3, 2021 Share Posted May 3, 2021 For a long time I had 2 square magnet K33 laying in boxes. One is fine. The other had strange measurements, was lacking low frequencies when mounted in La Scala. On closer examination it accrued that cone surround is "untreated", just clean fabrics that leaks air. To me looks like someone did recone but kind of wrong way. Cone part number seems to be same for both 451520-2, although one is R-451520-2 (R recone?). So question is if anyone knows if surround needs to be somehow treated/sealed on recone operation? Or maybe replacement cone should be "factory" treated and someone did something relay wrong with it? If possible I would like to fix that driver. First pic is faulty driver. Second one is working fine. You can clearly see treatment on second one. It glow slightly. Quote Link to comment Share on other sites More sharing options...
Bacek Posted May 3, 2021 Author Share Posted May 3, 2021 Found some tutorial on JBL speaker. Probably that part was missed. So for K33 I too should use polyvinyl glue? Quote Link to comment Share on other sites More sharing options...
Bacek Posted May 4, 2021 Author Share Posted May 4, 2021 Ok, I found another example. This time on K33 (B?) actually. Previous movie looks more professional but treatment is similar. Quote Link to comment Share on other sites More sharing options...
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