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Noisy PSW2000

Discussion in 'Subwoofers' started by nickthesafe, Jun 9, 2004.

  1. nickthesafe

    nickthesafe
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    Hello group....this is my first post so be gentle!
    I have a kef psw2000 which, after a few minutes of being switched on, emits a high frequency (low level) whistle accompanied by white noise. The wierdest thing is that the noise also makes it's way back to the amp (DSP-A2). Unplugging the coaxial cable shuts off the noise to the amp but the sub continues to misbehave. Sometimes during quite scenes the high frequency rises sounding like a distant siren, and then the sub switches to auto off with a thud. So far kef have been helpful and are willing to send me out a new amplifier unit for it, but it would be interesting to find out if anyone else has had a similar problem, is it common?.
     
  2. cosmic023

    cosmic023
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    Try another sub cable ? Does the sub make any noise when no cables are connected ??
     
  3. karkus30

    karkus30
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    This sounds like an amp problem.........Capacitors sound like that, when they are on there way out. Dont know how its getting back into your amp, maybe its a problem in the signal stage of the sub.

    Kef must think its an amp problem, as they are willing to send you a new amp. Substitute a new cable just in case. But Id put bets on a cap in the amp going tits up.
     
  4. nickthesafe

    nickthesafe
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    :clap:

    Would you believe it!, KEF sent me out a replacement panel so i could just swap the thing over. The modded one had two tranny's and two resistors moved to the main heatsink. Strange thing was it kept making the same noise, So i figured the problem was elsewhere. Lived with it all this time until just yesterday i had a bit of free time. Here's the result of a little probing and testing: U14 and U15 on the main board were getting too hot and introducing a random square wave into the audio signal. I moved both devices to the heatsink - PROBLEM SOLVED.
     
  5. dandini

    dandini
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    Hi Nick,

    U14 and 15 are regulators - is this what they moved? I'm curious as you mentioned resistors and transistors, not regulators?

    Any chance of a photo of your modded one?

    Thanks,

    Dan
     

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