Fried sub?

[Spoolin92GSX]

So I just got an amp and sub from a buddy of mine, since my car's all wired up with nothing to make noise He thought the amp was blown, so I just hooked up the sub to one of my amps (known working, tested with a known working sub) but it turns out it's a problem with the actual speaker. I've already done quite a bit of research on testing/repairing speaker drivers, and found ways to test the driver with a DMM. I went straight to the terminals on the driver, and got "OL" aka infinite resistance.. The very little info I could find said that's (usually) caused by the leads coming loose from the frame terminal - checking mine, they're still on there solid.

So my question is - Can anything other than loose wires cause a broken circuit in a speaker/subwoofer?

PS I know the voice coil(s) is/aren't toast, as that causes _lower_ resistance than the speaker's rated impedance. Sorry for the long post, and thanks in advance for any insight/ideas! I got it for free so it's not imperative to save it .

 

[JwpRider]

Yes, this is either a loose wire (between the terminal and the speaker frame...where the wire attaches to the speaker itself), or the coil is 'open' inside the speaker. This happens when there is too much current to the speaker. (overdriven). If you cannot find anything loose, than pitch it. Another quick test is to use a AA battery. Connect quickly to the terminals, with a good coil, the speaker cone should move in or out a little...if no movement...no good. (this is a quick coil test...not a test of the speaker quality)

 

[Spoolin92GSX]

Yeah I figure it's probably dust, but my other projects are on hold so I thought I'd mess around with it . I forgot about the battery test! Oh well, I'll probably just get the OK from my friend and pull it apart

 

[Don Lang]

i always used a 9 volt battery

 

[jmitch]

Set your DMM to read ohms and test the coils, it the coils dont read 1,2,4,6,8 ohms depending on what the vc supposed to read its a bad sub.

 

[Spoolin92GSX]

Set your DMM to read ohms and test the coils, it the coils dont read 1,2,4,6,8 ohms depending on what the vc supposed to read its a bad sub.

Exactly what I did, and got el zilcho - infinite resistance.. Oh well, maybe I can get something for it at the recycle center