View Full Version : Can a Voice Coil be blown without rattling etc?
05-30-2006, 01:50 PM
My CSi5 took an unfortunate tumble from the top of my t.v. today :( ugh. When I got it back up and running, the test tone sounded fuller through the right driver than the left and I was wondering if there could be damage to the speaker without making any "bad " noises like rattling, crackling etc.. Is that possible? It sounds to me as though the high mids are diminished on the one side.
P.S. Any suggestions about repair? It's still under the 5yr polk warranty.
05-30-2006, 02:05 PM
The midwoofs don't output the same frequency range, the left driver has a very limited response compared to the right. It's a '2.5 way' speaker.
05-30-2006, 02:36 PM
I think Russ called it. since something happenned, you put your ears to all the drivers to check them, and you noticed the cascading thing. your going to be sensitive to it for a while. I suggest watching movies like younormally do, at the normal volumes you listen to. if you srewed the driver, you would most likly hear something like the noises you allready mentioned.
05-30-2006, 02:39 PM
Well, RuSsMaN, you have officially made my day! Thanks for the information. I was really quite concerned with the potential hassle of repairs etc. and now I can breathe easy.
P.S. I ran a frequency sweep through the speaker and the one driver seems to drop off after around 1.6-1.7K... Is this the approximate point at which I should expect that to happen? Again, there were no rattles or crackles at any volume.
05-30-2006, 05:57 PM
It should be about 2.2KHz with a 12dB / octave rolloff.
05-30-2006, 06:31 PM
One is around 800 (iirc) cycles, the other around 2200 as stated.
05-30-2006, 07:24 PM
Hmm I wonder if mine does have an issue then. A 500hz difference is pretty large. I'll re-test it a few times and see if I can be more precise. Thanks for all the info so far. :)
05-30-2006, 08:15 PM
It's not going to have a 'bandwidth' issue. You're fine, get back to listening.
05-31-2006, 02:39 AM
Hehe, ok fair enough. Thanks again Russ
05-31-2006, 05:15 PM
Sounds normal. However if you want to test the woofers, simply unscrew them carefully from the cabinet with a 9/64" allen wrench, then disconnect the wires. You can hook the driver directly up to your stereo as if it was its own speaker temporarily and play something through it at a low to moderate volume and listen to the driver. If it sounds fairly clean (keep in mind there will be no bass or treble while testing in this fashion) then the component is probably OK. If you hear no sound, or it rattles buzzes, then that part is not working properly.
While the drivers are removed, take a peek inside to make sure nothing is floating around in there.
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