Vintage HiFi Audio Forum
Repair / Help Forum => Repair / Help => Topic started by: Sir Thrift-a-Lot on May 27, 2019, 11:06:31 AM
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I've heard that JBL refoams are hard to get aligned. I refoamed a pair of L40s. Both buzzed when I ran a test sweep. So I found the problem spots, carefully removed the surround from the frame in those spots, repositioned and reglued. I let those dry overnight and retested. Not even a slight buzz, even at high volume. So I glued the gaskets on and let those dry overnight.
I went to the basement this morning and ran high volume sweeps. One of the drivers buzzed! Drag. So I tried to remove the gaskets. I had glued them on too well and they tore. So I tried to reposition the foam and it tore. I guess I'll just order a new surround and try to source new gaskets and start over again.
In my defense though, how many flippers run high volume sweeps to check their refoam jobs? I wouldn't feel right sending something out that I knew had an issue.
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Sorry to "hear" your woes...
Hope it goes well from here...
I just do the "finger push" & play some music with bass to test...
George
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A 1.5 volt D cell battery across the terminals may expose scraping and a volt an a half of dc won't hurt the speaker