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MY OLD MARANTZ DIRECT DRIVE TURNTABLE WORKS FINE BUT WHEN I TURN UP THE VOLUME ( DOESN'T HAVE TO BE VERY LOUD )THE WOOFERS ON MY JBL'S START TO MOVE IN AND OUT DRAMATICALLY AND THE TONE ARM ON THE TURNTABLE STARTS TO BOUNCE - DOES NOT HAPPEN AT VERY LOW VOLUME. ANY IDEAS?

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  • phopkins3 Jun 26, 2008

    robotec,

    thanks for your response-i have only just purchased the jbl's.(lx55)- i don't have this problem with my original speakers which are still hooked up to the same amp (yamaha). the tracking force is set to 2 and i have tried increasing to 3 with no result. i have also pulled the bottom end out of the graphic equalizer and it still happens - its the strangest thing-.the amp does not have a rumble filter and the turntable is located in an entertainment unit whereas the jbl speakers are on stands to the side . i don't run both sets of speakers together.

    phopkins3

  • phopkins3 Jun 28, 2008

    robotec,

    thanks for your advice - the jbl lx55's are rear ported and once i moved them away from the wall corners the problem disappeared

    regards,

    phopkins3

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Hi phopkins3

You gotta love JBL bottom end:) Is this a new problem or something you have been putting up with. Check settings on the amp first. If you have excessive bass boost you may get this sort of problem. Acoustic isolation is what fixes it. IF bass frequencies are able to couple up to the turn table enough to bounce the needle, then you need to get the T/T better isolated from the speakers. Check that the body of the turntable is isolated from everything, and that it is sitting squarely on its feet. You could also use a rumble filter if your amp has one fitted. The setup on the turntable is also worth a look. Set tracking force to 2-3 grams. Check these things and report back to me here and we shall get to the bottom of your problem for you. :)

robotek

Posted on Jun 25, 2008

  • Graeme Ross
    Graeme Ross Jun 28, 2008

    excellent, just the extra bass extension of the JBL's Enjoy your newfound bottom end. :)

    robotek


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