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Buzzing after cloth around cone cracked

A few weeks ago I hooked up my Dad's old speaker set to a Sonos Amp. They are Bose 601 Series III stereo speakers. They were working fine until I (it was probably stupid, I know) turned the Bass to max, put the volume at 75% (125W Amp) and played everything that came up when I googled "Songs with the heaviest bass". Well, after 20 minutes or so, one of the speakers started to buzz all of sudden on all the mid frequencies (most of the speakers have cracked cloth but the mid was the first to be noticed). When I looked under the dust cover, the soft material between the edge of the cone and the speaker box/housing was cracked. Whenever I rest my finger on the cone, it stops buzzing. Being that my amp couldn't come close to blowing these speakers on max, I assume it happened because the cloth became brittle with age.

Is there anyway to fix this? Or, more preferably, what is the part called exactly and can I buy it? It doesn't seem like it would be very expensive to replace and these are nice speakers.

Thank you very much for your help
ethan1215
6 responses Add your response
millercarbon's avatar
millercarbon
12,531 posts
 
You do know the speakers are toast, right? Because I get the impression maybe you are gonna try and replace the surrounds. Which will be a waste of time and money. 

The buzzing you heard was the voice coils rubbing in the gap. Once that happens they are no longer perfectly round, and so even if the suspension and alignment are somehow still okay the voice coil isn't and will resume buzzing and scraping even with new surrounds. The only question is howl loud and how soon.  

But hey, look on the bright side- no more Bose!
mofimadness's avatar
mofimadness
4,982 posts
 
Bose has never been very good about giving out frequency responses for their speakers, but I would think somewhere between 60 hz-80 hz would work well.
ethan1215 OP
2 posts
 
Possibly. In any case I'll be getting a dedicated woofer so I can ruin my hearing without ruining my speakers. Speaking of that, what do you think a good cross over frequency would be for the sub?
mofimadness's avatar
mofimadness
4,982 posts
 
@ethan1215...I wasn’t saying that’s what happened in your case. Just stating that, from lots of experience.

I’m sure in your situation, the age of the speakers played the biggest part.

I want to also add, that when you increase any frequency range, (Bass, Mid, Treble, etc.) AND turn up the volume, you run the chance of over-driving that specific frequency range.  So maybe the amp was okay, but with the added increase in bass, you might have caused the driver to over extend.
ethan1215 OP
2 posts
 
Thank you so very much. That's exactly what I needed.

Also, the Sonos Amp has software to prevent it from being over driven. While not overly powerful, it is a very high tech amp as far as usability is concerned.
mofimadness's avatar
mofimadness
4,982 posts
 
I think you’re talking about the foam surrounds? Yes, they can be replaced.

https://www.ebay.com/i/150774051970?chn=ps&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&itemid=150774051970&targetid=596843714878&device=c&mktype=pla&googleloc=9028926&poi=&campaignid=2086087905&mkgroupid=76935344123&rlsatarget=pla-596843714878&abcId=1141016&merchantid=8433274&gclid=Cj0KCQiA0NfvBRCVARIsAO4930mceo7UHV4ZA-FT_enO54Cq3sR5rPul-QU1WxM1HG2yycFIhOv72aEaAn62EALw_wcB

Also, more drivers are blown from clipping the amp than actually putting too much power through them...
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