mbear2k Posted September 12, 2016 Report Share Posted September 12, 2016 I got a very nice pair of OLA's with near consecutive serial numbers. I've only re-foamed one woofer as the other was in great shape and had a good acoustical seal, tested good, etc. Now that the woofer I re-foamed is done and mounted, I find I have a pretty significant difference in what appears to be acoustical seal between cabinets. IE, on the untouched speaker, pressing in the cone takes a little effort and returns slowly. The one I re-foamed has a minimal back-pressure and returns much more quickly than the untouched woofer. There's a slight delay - so it doesn't appear to be a massive leak, but not near the same as the other.I've pulled the woofer twice and: resealed with Mortite, checked the tweeter seal, checked the back panel board for leaks, check for holes in the cabinet, checked mounting screws/holes, checked my work on the foam, checked for differences between the two woofers, IE dust-cap construction Note: I did not remove the dust-cap to re-foam, and visual inspection indicates they are the same. The only thing I can think of at this point is that the new foam is more porous? I bought the surround from a reputable dealer (who I will also query). Just thought I'd throw it out there to you guys for feedback, advice or things to try I hadn't thought of. Below shows the surround I used, prior to mounting (so you can see the outer flange width: . And this shows the surround installed and speaker mounted: Untouched on the left, my re-foam on the right. They both may have been re-foamed in the past, but the one on the right had holes in the foam and was disintegrating, while the one on the left was in good shape. Link to comment Share on other sites More sharing options...
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