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  1. #1

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    Default Fluttering Noise at High Volumes or Very Low Frequencies

    I just picked up a Carver TFM-35, which is the first separate amplifier I've ever owned \m/, so I've been fooling around with different music and playing some tones. Well I gotta say that the low end performance has improved MASSIVELY, but there's a wierd issue I ran into. This mainly occurs with tones from 10Hz-30Hz. At a certain point in volume, the mids will start producing a fluttering noise, kinda like a jackhammer, instead of a smooth tone. If I turn the volume down or move up to a higher frequency, the fluttering will stop. Is this what an overdriven driver sounds like or is it something else? Also, the left speaker starts fluttering at lower volumes than the right. What might be the cause of that?

    Thanks everyone!
    Polk SDA 2B (Pin/Blade) - Front L/R
    Polk SDA CRS+ (Blade/Blade) - Center
    Polk Monitor 5B - Rear L/R
    Onkyo TX-SR805 - Receiver
    Carver TFM-35 - Amplifier Front L/R
    12 AWG Monoprice Speaker Wire
    Blue Jeans Cable Belden F2 HDMI

  2. #2

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    Play music instead of test tones, report back.
    '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 turd by the clean end."

  3. #3

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    Quote Originally Posted by Assimilator87 View Post
    but there's a wierd issue I ran into. This mainly occurs with tones from 10Hz-30Hz...
    Low frequency test tones in the 10-30hz range are a severe torture test for speakers and you run a very real risk of damaging the drivers even at lower volume levels.Some of the noise your hearing I suspect is the result of the drivers reaching their excursion limits.

  4. #4

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    10-30hz is rough for most large dedicated subs with over an inch of cone travel, much less your poor little 65**'s :(

    You are almost certainly bottoming out all of your drivers when you do this, though some may bottom out sooner because they have a slightly different elasticity, or your channels might not be balanced.

    This may permanently damage the cones, so I suggest you save the test tones, which are mostly sub audible to your ears anyway, for a tactile transducer, or the like, and feed your SDA's a steady diet of real sounds.

  5. #5

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    Thanks for the advice guys. I'm so used to underpowered speakers that I had no idea what an overdriven one even sounds like.

    Quote Originally Posted by F1nut View Post
    Play music instead of test tones, report back.
    Ah, but I like the soothing sound of single tones =)
    Polk SDA 2B (Pin/Blade) - Front L/R
    Polk SDA CRS+ (Blade/Blade) - Center
    Polk Monitor 5B - Rear L/R
    Onkyo TX-SR805 - Receiver
    Carver TFM-35 - Amplifier Front L/R
    12 AWG Monoprice Speaker Wire
    Blue Jeans Cable Belden F2 HDMI

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