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Anyone else use a medical stethoscope ?

Discussion in 'Electronic Repair' started by N Cook, Oct 8, 2007.

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  1. N Cook

    N Cook Guest

    I've previously only used one with the diaphragm replaced with a length of
    polythene tube to discover where squeels or squeaks were coming from in
    mechanical equipment.
    This time a bass speaker that was making rattling/scratchy noises when
    driven with sub-100Hz feed.
    Nothing wrong with cone/gluing/skirt/spider etc and fingering the driven
    cone (wearing ear defenders) made no real difference to the random rattle.
    Could only summon it to order by placing the cab on its side, otherwise in
    band use it would appear intermittently.
    Decided to listen with the stethoscope , with diaphragm attached , while
    driving with 60Hz, not deafening as presumably because not tuned for
    sub-100Hz.
    Rattley/scratchy noise was then noticeably prominent in one area of the
    speaker frame mounting.
    Removing again from the cab , there was a length of unglued and uncompressed
    foam, about 4mm at widest, around the mounting flange that must have been
    resonating and flapping against the frame.
     
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