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"blown speakers"

When a speaker "blows" what actually happens. I suppose its different between a tweeter and woofer, but is there some mechanical damage or is it electrical. does something break? Besides a woofer cone ripping, what happens to a tweeter if it is still working, but raspy or staticy? I have heard "blown" speakers before, or ones that didnt work at all, but I really dont know what it is that breaks and whether it is fixable or just replace.
manitunc
rleff
1,065 posts
 
You could take a driver out 1 at a time and using a DVM measure the resistance of the speaker at the speakers terminals;maybe one is open and if they are wired in series then all the drivers would appear to be non operational.
manitunc OP
795 posts
 
took it to the dealer to figure out. I'll update when I hear anything.
manitunc OP
795 posts
 
ok, got the verdict today. the crossover was broken in two and laying at the bottom of the speaker. Unlikely caused by overdriving. I also doubt it happened in shipping as the speakers were well packed in the factory boxes. I suspect the original owner dropped the speaker at some time, causing an impact enough to crack the crossover board and perhaps later vibrations finished the job. Anyway, it will be replaced and fixed.
This was an interesting voyage of investigating a problem that wasnt apparent on first examination. Easy to jump to conclusions on partial information.
markpao
519 posts
 
Manitunc,

Don't rule out the shipper dropping the package as this happens a lot more than one would think. The package could drop and land flat, so no damage would be evident to the box or the outside of the speaker, but cause internal damage like you're speaking of mainly because of the weight of the contents.

I would think there would be visual damage outside the speaker, or at least markings if someone dropped a speaker that wasn't packaged?
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