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Thread: buzz/vibration

  1. #1

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    Default buzz/vibration

    I own a pair of Monitor 7Cs bought way back in 88. At times one of the speakers makes a buzzing/vibrating sound that is more or less continuous for a period of time before cutting out. The sound does not appear to be dependent on the volume. At other times, there does not appear to be any problem at all. Is the midrange blown? Or could it be the subwoofer? How would I know for sure? Is there a test I can perform to determine which of the drivers may be faulty?

  2. #2

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    Does it sound like it's only happening at certain frequencies?

    To test the midrange, place your fingers equidistant around the driver itself and press in gently and evenly...if you hear a scratching sound, then it's blown...
    Main HT
    Magnepan 1.6QR fronts, POlk R15 surrounds, Pioneer SC-25, Parasound Halo A23, Oppo BDP-105, Panasonic TC-P60ZT60, Sony PS3, Apple TV

    Bedroom System
    Polk Blackstone TL3, Polk PSWi225 Wireless Sub, HK 3490 Integrated, Oppo BDP-103, Sharp Aquos 32" TV, Apple TV

    Office Rig
    27" iMac w/Amarra, AudioQuest Dragonfly 1.2, Focal XS Book, Schiit Valhalla, Cypher Labs Theorem 720, Philips Fidelio X1, Sennheiser HD600, HiFiMan HE-500, B&W P7, LG 47LM7600, Sony PS3, Apple TV

  3. #3

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    Done. And it's definitely scratching. I guess I'm off to the service and parts area now. Thanks Polkmaniac.

  4. #4

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    Originally posted by Numbers
    Done. And it's definitely scratching. I guess I'm off to the service and parts area now. Thanks Polkmaniac.
    Give Ken S at Polk CS a call and tell him you're a club Polk member, he'll give you a discount...
    Main HT
    Magnepan 1.6QR fronts, POlk R15 surrounds, Pioneer SC-25, Parasound Halo A23, Oppo BDP-105, Panasonic TC-P60ZT60, Sony PS3, Apple TV

    Bedroom System
    Polk Blackstone TL3, Polk PSWi225 Wireless Sub, HK 3490 Integrated, Oppo BDP-103, Sharp Aquos 32" TV, Apple TV

    Office Rig
    27" iMac w/Amarra, AudioQuest Dragonfly 1.2, Focal XS Book, Schiit Valhalla, Cypher Labs Theorem 720, Philips Fidelio X1, Sennheiser HD600, HiFiMan HE-500, B&W P7, LG 47LM7600, Sony PS3, Apple TV

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