SDA-2 Buzz At Higher Volumes

tbliven098
tbliven098 Posts: 12
edited April 2010 in Vintage Speakers
This is my first post. Hope it goes well. I recently picked up a pair of SDA-2's for my Marantz 2270 reciever. They start to buzz at higher volumes - especially if the song has a lot of mid-range sound. If I disconnect the inter-connect, they work fine. And if I use a different receiver, they work fine. The Marantz works fine with other speakers.

So it's something between the Marantz and the speakers. Is it some kind of grounding problem or is the Marantz different in someway that it just will not drive the SDA's?

Help. Thanks.
Thor
Marantz 2270
Polk Audio SDA-2
JBL PB10
Post edited by tbliven098 on
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Comments

  • chandler9a
    chandler9a Posts: 878
    edited April 2010
    Sounds like the Marantz is the problem but also could be a bad connection somewhere. The IC cable could be bad as well.
    Others with more knowledge will chime in for sure.

    Good Luck!
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  • tbliven098
    tbliven098 Posts: 12
    edited April 2010
    Hope someone can come up with a solution. The combination of the Marantz and the SDA's at lower volumn is incredible.
    Thor
    Marantz 2270
    Polk Audio SDA-2
    JBL PB10
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  • F1nut
    F1nut Posts: 50,755
    edited April 2010
    It would seem as though the Marantz is non-common ground, although that is highly unusual for a receiver.

    Do you have a VOM?
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • tbliven098
    tbliven098 Posts: 12
    edited April 2010
    Yes, I have a VOM. What should I be checking?
    Thor
    Marantz 2270
    Polk Audio SDA-2
    JBL PB10
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  • sda2mike
    sda2mike Posts: 3,131
    edited April 2010
    F1nut wrote: »
    It would seem as though the Marantz is non-common ground, although that is highly unusual for a receiver.

    Do you have a VOM?

    the marantz is common-ground...i ran the same combo for 7 years...maybe check every screw in your cabinet???
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  • tbliven098
    tbliven098 Posts: 12
    edited April 2010
    There is a chassis ground screw on the back. Should I ground it to the outlet?
    Thor
    Marantz 2270
    Polk Audio SDA-2
    JBL PB10
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  • sda2mike
    sda2mike Posts: 3,131
    edited April 2010
    tbliven098 wrote: »
    There is a chassis ground screw on the back. Should I ground it to the outlet?

    every screw in the speaker cabinet;)
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  • tbliven098
    tbliven098 Posts: 12
    edited April 2010
    Just an FYI: I did try the grounding screw - no difference. And I guessed that the common ground means that the negative terminals are common? I disconnected the speakers and checked and they do appear to be common - if that's what you meant?
    Thor
    Marantz 2270
    Polk Audio SDA-2
    JBL PB10
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  • F1nut
    F1nut Posts: 50,755
    edited April 2010
    I'm out of ideas.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • tbliven098
    tbliven098 Posts: 12
    edited April 2010
    Thanks for your help. I went through every screw I could safely check. No change. Any other ideas out there, I'd love to hear them.
    Thor
    Marantz 2270
    Polk Audio SDA-2
    JBL PB10
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