Is anybody on this forum interested is repairing/rebuilding speakers? I have a general question about voice coil dimensional tolerances and can't find any info on the 'ole google.
I have a sub that was making intermittent noise so I took it apart and can't find a dang thing wrong with it. The voice coil is .020" out of round but I don't know if that is acceptable on a 2" voice coil or not. I have used 4 other subs on the same amp since and no problems with any of them.
I have a sub that was making intermittent noise so I took it apart and can't find a dang thing wrong with it. The voice coil is .020" out of round but I don't know if that is acceptable on a 2" voice coil or not. I have used 4 other subs on the same amp since and no problems with any of them.
Depends on the noise. Voice coil rub is one failure mode that also shows up as scrapes on the coil. Dirt in the gap will cause noise and voice coil scratches.
Lead in tinsel failure results in noise at higher power levels. Bad solder joints in the voice coil lead outs can also cause noise.
First thing to try is to use a swept tone to see if the noise is frequency specific. That is typical of a voice coil that is not properly centered.
Lead in tinsel failure results in noise at higher power levels. Bad solder joints in the voice coil lead outs can also cause noise.
First thing to try is to use a swept tone to see if the noise is frequency specific. That is typical of a voice coil that is not properly centered.
Thanks for your response. No evidence of scraping on the coil. Tinsel leads were intact. Noise was present at all volumes. I did not try a sweep on it, that is a good idea, but it is disassembled now. It is possible the voice coil to tinsel lead connection broke but I really doubt it with as much glue as they put on this thing, but still a possibility. It does check out with an ohm meter though. I guess this is going to be an unsolved mystery.
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