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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: RE: Spectralinear 1280 Spkr Foam Surround Replacement posted by strijw426 on May 22, 2012 at 13:17:27:
As it turned out, I finally had to replace the 8" woofers and used some MCM 55-1190 units. The old woofers had damaged voice coils from being operated with disintegrated foam surrounds. The repair kit did not keep them from continuing to make scraping and clicking noises.
The new woofers worked well, but revealed a problem with one 12" passive radiator, whose edge was slapping against the baffle cut-out on one side of the cabinet at about 40Hz. Since it was glued in place and not removable, I wound up putting some clear GE silicone caulk along this outer edge and managed to stop the noise.
I did replace the 4mFd and 8mFd non-polarized electolytics with 4mFd and 8.2mFd polypropylene caps from Parts Express. The cabinets have a pretty good fiberglass lining already, and I was satisfied with the repair after running several frequency sweeps of 20Hz to 100Hz which smoothed out nicely. Best response from the bass region is from about 30Hz and up. Some useable output is obtained down to about 20Hz but several dB down.
The Kenwood KR-2600 receiver that drives these speakers has very effective tone controls and does a good job of quieting the treble response to a satisfactory level. The owner has been used to this for years, so I saw no need to do more to the speakers.
Thanks for the input though. I never know when I may encounter a similar situation that may need the level controls added.
Joe
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- RE: Spectralinear 1280 Spkr Foam Surround Replacement - strijw426 16:25:37 06/25/12 (0)
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