Sub makes scratching noise when moving cone

[SiW80]

Bought a used sub, but when I move the cone gently by hand there is a scratching sound. The cone moves, but slowly.

Assume it got a knock whilst being shipped.

How can I repair it? Or is it dead?

Cheers!


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[blockrocker]

Its rather seized up or was built with the cone off center. Either way it will require a re-coning. Just a best guess without seeing it.

Edit: I guess you could also have a small piece of debris around the voice coil too. What kind of sub?

[rob feature]

I doubt that happened in shipping. It was likely that way before it went in the box.

[ca90ss]

Try testing it with a 9v battery. Some subs have a tight gap and will scrape if pushed in by hand even slightly off center. It's usually more of an issue with pro sound and more efficient drivers but it's worth checking before condemning the sub.

[Justin Zazzi]

Try testing it with a 9v battery. Some subs have a tight gap and will scrape if pushed in by hand even slightly off center. It's usually more of an issue with pro sound and more efficient drivers but it's worth checking before condemning the sub.

I was going to suggest this too. It can be easy to make one rub if you're not pushing with exactly perfectly even pressure.

[SiW80]

Thanks all - it’s a Peerless XLS 12.

The other one I got from the same seller is fine.

Will try the 9v battery.

If it’s debris assume I need to take the cone off?


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[dumdum]

Thanks all - it’s a Peerless XLS 12.

The other one I got from the same seller is fine.

Will try the 9v battery.

If it’s debris assume I need to take the cone off?


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if it’s debris it’s dead as you can’t get recones for that Si and debris in the gap is pretty much a disaster if it is that, especially if it’s metal shrapnel... I once had an atomic APXX 18 which would blow a coil every time I burped it in the red Marbella... in the end I had to get another motor and rebuild it, once it blew a second time I marked where the coil had detonated and built it a third time, it blew in the exact same spot every time

[SiW80]

Hoping it’s just the voice coil out of alignment...


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[SiW80]

If it is dead, how hard is it to convert the sub to a passive radiator?!


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[Grinder]

If it is dead, how hard is it to convert the sub to a passive radiator?!


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Given the rub/scratching coil, you would need to remove the magnet assembly and then attach a means of adding adjustable mass to the voice coil, which should be fairly straightforward. On the other hand, tuning would be guesswork/trial and error/by ear. If you're really into DIY and experimentation, it could be a fun project. However, if you mostly just want a cheap PR, you'd probably be better off buying one.