blown voice coil?

shawn earnheart
shawn earnheart Posts: 13
edited January 2007 in Car Audio & Electronics
I think i have a blown voice coil. This is my system: X590 Kenwood Head Unit, MRP-F240 Alpine Amp in bridge mode (100W x 2 RMS 360 x 2 peak) hooked to db 6500 component Polks in my front doors and db 460 in rear pillar running off the head unit only. System started cutting out when balance was set to 0. I can put the balance on the right side and everything is fine. So I swapped speaker outputs on the amp, problem stayed on the left side. Would like to know what would cause this to happen, did I just get a bum speaker? Also, what are my options, can I just buy a replacement speaker?
Post edited by shawn earnheart on
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  • MacLeod
    MacLeod Posts: 14,358
    edited January 2007
    Are both left speakers cutting out?
    polkaudio sound quality competitor since 2005
    MECA SQ Rookie of the Year 06 ~ MECA State Champ 06,07,08,11 ~ MECA World Finals 2nd place 06,07,08,09
    08 Car Audio Nationals 1st ~ 07 N Georgia Nationals 1st ~ 06 Carl Casper Nationals 1st ~ USACi 05 Southeast AutumnFest 1st

    polkaudio SR6500 --- polkaudio MM1040 x2 -- Pioneer P99 -- Rockford Fosgate P1000X5D
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  • shawn earnheart
    shawn earnheart Posts: 13
    edited January 2007
    no. i had speaker checked at radio shack its blown also hooked up another speaker i had and it works fine.
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  • MacLeod
    MacLeod Posts: 14,358
    edited January 2007
    Well that was easy. Glad I could help! :p
    polkaudio sound quality competitor since 2005
    MECA SQ Rookie of the Year 06 ~ MECA State Champ 06,07,08,11 ~ MECA World Finals 2nd place 06,07,08,09
    08 Car Audio Nationals 1st ~ 07 N Georgia Nationals 1st ~ 06 Carl Casper Nationals 1st ~ USACi 05 Southeast AutumnFest 1st

    polkaudio SR6500 --- polkaudio MM1040 x2 -- Pioneer P99 -- Rockford Fosgate P1000X5D
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  • shawn earnheart
    shawn earnheart Posts: 13
    edited January 2007
    thanks. but what about buying a replacement speaker,is that something that polk offers?
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  • MacLeod
    MacLeod Posts: 14,358
    edited January 2007
    If you bought them thru an authorized dealer and not off of Ebay or fly by night dealer, they may be under warranty.

    Give Polk CS a call and they can help you more.

    Customer Service:
    polkcs@polkaudio.com
    9am - 6pm, M-F, EST (USA)
    800-377-7655 toll free phone
    410-764-5470 fax
    polkaudio sound quality competitor since 2005
    MECA SQ Rookie of the Year 06 ~ MECA State Champ 06,07,08,11 ~ MECA World Finals 2nd place 06,07,08,09
    08 Car Audio Nationals 1st ~ 07 N Georgia Nationals 1st ~ 06 Carl Casper Nationals 1st ~ USACi 05 Southeast AutumnFest 1st

    polkaudio SR6500 --- polkaudio MM1040 x2 -- Pioneer P99 -- Rockford Fosgate P1000X5D
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  • Eiderlon
    Eiderlon Posts: 23
    edited January 2007
    Blown VCs are more often caused by distortion and clipping than by pure overpower conditions.
    Lexicon Toshiba Crown EAW
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  • MacLeod
    MacLeod Posts: 14,358
    edited January 2007
    Voice coils are fried only when more heat is built up in them than they can dissipate. The only way for this to happen is by overpowering. The reason why clipping is associated with fried speakers is because when an amp clips, it sends out a signal at a wattage limted only by input voltage which is usually double its normal output. And if this increase in power is more than the VC can handle, it fries.

    Distortion is not something that can hurt a speaker. It is merely a symptom of the speaker being overpowered or the amp being overdriven. My favorite analogy is a gun. If I shoot you, will you be injured by the bullet or the loud bang? The distortion is the bang. The overpowering is the bullet.
    polkaudio sound quality competitor since 2005
    MECA SQ Rookie of the Year 06 ~ MECA State Champ 06,07,08,11 ~ MECA World Finals 2nd place 06,07,08,09
    08 Car Audio Nationals 1st ~ 07 N Georgia Nationals 1st ~ 06 Carl Casper Nationals 1st ~ USACi 05 Southeast AutumnFest 1st

    polkaudio SR6500 --- polkaudio MM1040 x2 -- Pioneer P99 -- Rockford Fosgate P1000X5D
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