On 20260502 08:03:25, Frank Bures wrote:
On 2026-04-30 23:23, Tim via users wrote:
Tim:
We had a noisy mike cable in a studio. The plastic (or whatever it
was) was too soft, so it would easily deform (outer shield would get
closer to inner core) and change it's capacitance when moved. If you
banged the cable it would put a loud "CRACK!" into the signal. One of
the weirdest faults I'd diagnosed.
I've had the same problem with Neumann condenser mic in the 60's. It was the
one with sub-miniature valves in the pre-amplifier, way before transistors.
We used the mic in the band and the cable basically precluded any singer's
dance moves :-)
Frank, you should be aware that most cable insulation is piezoelectric, enough
so that I had an experiment screwed up over a weekend by a local earthquake
decades ago. In this case it was a low loss 3/8" coax cable.
Good quality XLR cables are made with graphite loaded materials to minimize
effects of moving around the stage. Prestaging cable positions can minimize its
movement. But, if you bang on the stuff it's going to complain.
{^_^}
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