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500R earthing ?

Discussion in 'TAG McLaren Audio Owners' Forum' started by ukfatboy, Jul 8, 2004.

  1. ukfatboy

    ukfatboy
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    Dear All,

    Wonder if I could get a bit of help please ?

    Recently upgraded and got myself a second 500r and some B&W 802's so now going to bi amp front three channels . So I've set up everything and wow !

    Except one little problem , I've got a 1/2 buzzing/ 1/2 hissing coming out of the tweeters. Not loud but there and gets louder as you crank volume.

    By turning bits on and off like processor and other 500r i have narrowed it down to the 500r that powers 4 rear channels and 1/2 of a centre. I can turn everything else off and hiss is still there.

    So I reckon its a grounding problem. Why you may ask? well its the only thing I know of that makes this sort of issue. My problem is that I nothing at all about electrics , absolutely nothing.

    I should point out that the tag goes into an isoteck vision which then connects to plug in wall.

    Any ideas much appreciated !
     
  2. roversd1

    roversd1
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    What equipment do you have?
     
  3. ukfatboy

    ukfatboy
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    Ok full list is :-

    rotel 1098 processor
    2 X 500r power amps
    tag 32flr dvd
    b&W nautilus 802 front speakers
    b&W nautilus htm centre speaker
    monitor radius 90's for surround and rear channels
    isotek vision X2
    sony plasma
    tivo X 2
    svhs player
    2 X HCPC ( one for video scaling ) ( one for music jukebox )
     
  4. roversd1

    roversd1
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    Sorry, dont know what a '500R' is...no TMA products had that name.

    100x5R?

    250x3R?
     
  5. ukfatboy

    ukfatboy
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    100x5R :suicide:
     
  6. roversd1

    roversd1
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    Grounding is usually a 'hum' - a 'hiss' points to something else - can you hear it when you have disconnected the amps from the processor?

    How does it behave without the Isotek?

    You can try swapping cables

    Swapping the channels to see if the 'noise' follows the cables or stays in one place?

    Lots of homework to do!
     
  7. ukaudiophile

    ukaudiophile
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    Hello,

    OK, here's an easy one, check the mains leads going into the Isotek Vision and going from the Vision to the amps. Make sure they're all earthed. Now check the mains plugs where everything is plugged in, an earth checking plug will cost around £10, and ensure the earth's are actually connected and working. It sounds like a ground loop is at work somewhere, it's just a matter of finding it.

    You mention it get's worse as you turn up the volume, have you tried changing out the interconnects from the processor to the power amp and seeing if that helps?

    Let me know how you get on.

    Best wishes,

    Dave
     

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