Can a Voice Coil be blown without rattling etc?

banta
banta Posts: 4
edited May 2006 in Troubleshooting
Hi there,

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.

Thanks,
Banta

P.S. Any suggestions about repair? It's still under the 5yr polk warranty.
Post edited by banta on
· Share on FacebookShare on Twitter

Comments

  • RuSsMaN
    RuSsMaN Posts: 17,986
    edited May 2006
    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.

    Cheers,
    Russ
    Check your lips at the door woman. Shake your hips like battleships. Yeah, all the white girls trip when I sing at Sunday service.
    · Share on FacebookShare on Twitter
  • ohskigod
    ohskigod Posts: 6,505
    edited May 2006
    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.
    Living Room 2 Channel -
    Wiim Ultra. Jolida CD player. Fiio k11 R2R DAC, XTZ as300 Edge amp. Focal Cobalt 826 towers,

    Upstairs 2 Channel Rig -
    Classe Audio 5 Preamp, DIY1200as2 Icepower Amp x 2, Wiim pro streamer and Topping E70 Velvet DAC, California Audio Labs DX1 CD player, Polk LSi15's with MM840 woofer upgrade.

    Studio Rig - Scarlett 18i20(Gen3) DAW, Schitt Saga 2 preamp, Topping a90 headphone amp, Mac Mini, Audiophonics Hypex NC252m amp, Polk r200's
    · Share on FacebookShare on Twitter
  • banta
    banta Posts: 4
    edited May 2006
    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.

    Take Care,
    Banta

    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.
    · Share on FacebookShare on Twitter
  • michael_w
    michael_w Posts: 2,813
    edited May 2006
    It should be about 2.2KHz with a 12dB / octave rolloff.
    · Share on FacebookShare on Twitter
  • RuSsMaN
    RuSsMaN Posts: 17,986
    edited May 2006
    One is around 800 (iirc) cycles, the other around 2200 as stated.
    Check your lips at the door woman. Shake your hips like battleships. Yeah, all the white girls trip when I sing at Sunday service.
    · Share on FacebookShare on Twitter
  • banta
    banta Posts: 4
    edited May 2006
    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. :)
    · Share on FacebookShare on Twitter
  • RuSsMaN
    RuSsMaN Posts: 17,986
    edited May 2006
    It's not going to have a 'bandwidth' issue. You're fine, get back to listening.

    Cheers,
    Russ
    Check your lips at the door woman. Shake your hips like battleships. Yeah, all the white girls trip when I sing at Sunday service.
    · Share on FacebookShare on Twitter
  • banta
    banta Posts: 4
    edited May 2006
    Hehe, ok fair enough. Thanks again Russ
    · Share on FacebookShare on Twitter
  • Eric W
    Eric W Posts: 556
    edited May 2006
    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.
    -Eric
    -Polk Audio
    · Share on FacebookShare on Twitter