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Re: [Electronica] Subwoofer Issue

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  • dangermouse
    Does it still amplify sound (albeit distorted by the fluttering )? This might be what we used to call motorboating-- spontaneous low-frequency oscillation
    Message 1 of 2 , Sep 14 1:31 PM
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      Does it still amplify sound (albeit distorted by the "fluttering")?

      This might be what we used to call "motorboating--" spontaneous
      low-frequency oscillation in the amp caused by lack of proper supply
      decoupling. Check the filter capacitors in the power supply, and any other
      decoupling caps in the amp. Perhaps you just have some dried-out
      electrolytics.

      On the other hand, once I actually had a case of apparent motorboating
      caused by a defective amplifier IC. That was a little weird, but it
      happened.

      -DM

      ----- Original Message -----
      From: "Brett" <madairman74@...>
      To: <home_electronics@yahoogroups.com>
      Sent: Sunday, September 14, 2003 9:52 PM
      Subject: [Electronica] Subwoofer Issue


      > I've had a JBL PB12 Home Subwoofer for 2 years which has played great
      > until about a month ago. One night at 4:00am in the morning out of
      > the blue, the sub started what I would describe as a
      > loud "fluttering"- yes it was on. Just constant bass fluttering.
      > Since then anytime its turned on it makes this "fluttering" even if
      > it is not connected to the receiver via RCA's.
      >
      > Anyone know how I can troubleshoot this, or what I might look at? The
      > warrenty ended so I want to repair it myself to save $dough$.
      >
      > Thanks.
      >
      > Brett
      >
      >
      >
      >
      > Translation, Web Design, Marketing & Advertising: MultiMedia Ltd,
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    • Brett
      hey thanks for the reply, sorry took so long to get back. I did have it plugged into an extention cord. I ll try chaging the outlet and see if that works.
      Message 2 of 2 , Sep 17 12:43 PM
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        hey thanks for the reply, sorry took so long to get back. I did have
        it plugged into an extention cord. I'll try chaging the outlet and
        see if that works. Thank you.

        --- In home_electronics@yahoogroups.com, "dangermouse"
        <dangermouse1956@g...> wrote:
        > Does it still amplify sound (albeit distorted by the "fluttering")?
        >
        > This might be what we used to call "motorboating--" spontaneous
        > low-frequency oscillation in the amp caused by lack of proper supply
        > decoupling. Check the filter capacitors in the power supply, and
        any other
        > decoupling caps in the amp. Perhaps you just have some dried-out
        > electrolytics.
        >
        > On the other hand, once I actually had a case of apparent
        motorboating
        > caused by a defective amplifier IC. That was a little weird, but it
        > happened.
        >
        > -DM
        >
        > ----- Original Message -----
        > From: "Brett" <madairman74@y...>
        > To: <home_electronics@yahoogroups.com>
        > Sent: Sunday, September 14, 2003 9:52 PM
        > Subject: [Electronica] Subwoofer Issue
        >
        >
        > > I've had a JBL PB12 Home Subwoofer for 2 years which has played
        great
        > > until about a month ago. One night at 4:00am in the morning out of
        > > the blue, the sub started what I would describe as a
        > > loud "fluttering"- yes it was on. Just constant bass fluttering.
        > > Since then anytime its turned on it makes this "fluttering" even
        if
        > > it is not connected to the receiver via RCA's.
        > >
        > > Anyone know how I can troubleshoot this, or what I might look at?
        The
        > > warrenty ended so I want to repair it myself to save $dough$.
        > >
        > > Thanks.
        > >
        > > Brett
        > >
        > >
        > >
        > >
        > > Translation, Web Design, Marketing & Advertising: MultiMedia Ltd,
        > http://www.teleactivities.com
        > > Wealth Casino: http://www.wealthcasino.com
        > > Planet Star Casino: http://www.planetstarcasino.com
        > >
        > > To unsubscribe from this group, send an email to:
        > > home_electronics-unsubscribe@egroups.com
        > >
        > >
        > >
        > > Your use of Yahoo! Groups is subject to
        http://docs.yahoo.com/info/terms/
        > >
        > >
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