Speakers blown!?

 

Bronze Member
Username: Lostnconfused

Far Far Away, I Forgot USA

Post Number: 12
Registered: Nov-04
When I push down on my speaker cone I hear a scraping like sound and they dont sound as clear or as loud as they use to; are they blown?
 

Gold Member
Username: Glasswolf

NorthWest, Michigan USA

Post Number: 6257
Registered: Dec-03
does the cone snap back into it's regular resting position or does it stay where you pushed it when you hear it scrape?
usually that sound indicates a blown voice coil.
what you hear is the unravelled coil scraping against the magnet structure.
 

Bronze Member
Username: Lostnconfused

Far Far Away, I Forgot USA

Post Number: 13
Registered: Nov-04
it pops back up when I press it down but it does make a scraping sound. Anyway to examine the coil and see if its broken other then the sound it makes?
I think I may have played them to loud with stock HU power :-(!
 

Gold Member
Username: Glasswolf

NorthWest, Michigan USA

Post Number: 6291
Registered: Dec-03
you'll need to use a digital multimeter.
test DC resistance across the good speaker, then compare that to the reading on the "bad" one.
see if they are exactly the same.
If the bad one is blown or the coil is damaged, you'll probably see a lower resistance, unless the coil is somehow unraveling, but not causing any type of a short inside the speaker. In that case it'd still probably read a matched resistance to the good speaker.
 

Gold Member
Username: Glasswolf

NorthWest, Michigan USA

Post Number: 6292
Registered: Dec-03
great profile btw. made me laugh.
 

Bronze Member
Username: Lostnconfused

Far Far Away, I Forgot USA

Post Number: 14
Registered: Nov-04
do other speakers that are ok make that sound if you push the cone down?
 

New member
Username: Mrrogers

Marshall, Illinois Usa

Post Number: 9
Registered: Nov-04
i have the same problem. but it only happens when i push on the bottom of the cone. and it sounds likeits brushing something. but it plays fine when im hitting the lows. what kind of sub is it.
 

Gold Member
Username: Glasswolf

NorthWest, Michigan USA

Post Number: 6330
Registered: Dec-03
any speaker can make this sound if the cone is pushed on one side or unevenly. it's the sound of the coil windings rubbing against the inside of the magnet structure.
doing this too much will damage the speaker, too.
that's why it's recommended you not push on speakers if you can avoid it.

 

Bronze Member
Username: Wojopro

Post Number: 45
Registered: Nov-04
Generally when a sub is blown an immediate sign that it is blown is that it will have a strange odor around the magnet. If you blown it really bad the smell will be in your car for awhile.
 

Gold Member
Username: Glasswolf

NorthWest, Michigan USA

Post Number: 6368
Registered: Dec-03
not always the case though. if it's a sealed box, the sub's coils are sealed inside the enclosure, and the air is trapped there.. no air, no smell.
Although I don't recall if Mallory ever mentioned if this is indeed a sub we're talking about, or a component speaker.
 

Bronze Member
Username: Wojopro

Post Number: 52
Registered: Nov-04
Yup and never said an enclosure type also... Too many variables
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