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    CONTROLACE's Avatar
    CONTROLACE Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Feb 14, 2010, 08:50 PM
    Why would touching a test lead to hot side of recept.cause interference to audio
    How can just the test lead alone. Un connected to anything ,cause subwoofer to pop ? To me seems same as adding 24" of wire to hot connection. Same reaction with bare tip on screwdriver, etc.. Built in amp causeing some kind mag. Field? Antana type ?
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    Feb 14, 2010, 09:12 PM

    You have just created a 60 Hz transmitter.

    When a hot and a neutral run near each other or in a metal box some amount of shielding or cancellation takes place.
    DanielF's Avatar
    DanielF Posts: 158, Reputation: 14
    Junior Member
    		  
    #3

    Feb 14, 2010, 10:31 PM

    Every mains wired house has an electromagnetic field radiated from the mains wiring. If you're in the USA it will be at 60Hz, or in the 'civilised' :-) world, 50Hz.

    Any piece of metal (wire, screwdriver blade) acts as an antenna and picks up that 50/60Hz radiation (and a lot of its harmonics). So when you touch such an antenna to an audio amplifier input, the picked-up 'buzz' (fundamental plus harmonics) is amplified and makes a sound in the speaker.

    Daniel
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