At 8:33 PM +0200 5/17/07, Yannick Dauby wrote:
>Dear Nature Recordists,
>
>I need some advice...
>I have bought last year a second-hand MKH30 which makes me crazy.
>
>Last summer, after using it during a few months without any problems, it
>showed some very strange low rolling sounds.
Hi Yannick--
Also sounds like a faulty capacitor-- a problem my mkh-30 developed over ti=
me.
> I send it to Sennheiser in
>Germany where they changed the capsule. Since I received it, it
>seems to work except a new strange behaviour :
>the sounds is ok except when the MKH30 is getting close to my MKH40, in
>M-S configuration.
>Then, I have in both microphones a very high frequency sound at low
>level (but still disturbing), sometimes stable, sometimes shifting.
I have come across some mysterious interactions that were traceable
to mechanical vibrations. I'd first experiment with shock mounting.
>
>I tested with my SD722 and my Digidesign sound card, I changed my cables
>but the only thing that stops this annoying whistling is to put a piece
>of aluminium foil between the two microphones.
>So I believe that this is an electromagnetic interference between the
>two capsules ?
Aluminum foil is new wrinkle. The capsules are oscillators. Could be
interference,.. if something isn't working correctly. Maybe post this
question to the Micbuilders list?
> But why my MKH40 get it also ?
>
>What should I do :
>send again the microphone at Sennheiser Germany (because it seems that
>in France, the technicians aren't able to repair it) and waiting 3
>months like the last time (I don't know why do these guys work so slowly
>!) ?
>Open the microphone and see if the technician forgot to connect the EMI
>protection grid ?
>Keep always aluminium foil between the microphones (mmmmh) ?
>
>Any miracle advice ? ;-(
>
>Friendly,
>
>Yannick
>
>--
>
>www.kalerne.net
>www.yannickdauby.net
>
>
>
>
>"While a picture is worth a thousand words, a
>sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause
>
>Yahoo! Groups Links
>
>
>
--
Rob Danielson
Peck School of the Arts
Department of Film
University of Wisconsin- Milwaukee
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