In article ,
David Farber wrote:
a sensitive stethoscope. Each left and right mic contains two small mics that
face each other.

The shield stuff is probably just foam to keep wind and dust out of the
mics. This won't make the mics more sensitive in the way you describe --
it's absence will make wind noise more objectionable. Try and find a
suitable foam replacement. Codge something together from a standard foam
mic-protector if necessary.

If your mics really are *each* made of 2 small mics facing each other, that
is, 4 mics total ... it sounds like they are being used to do noise
cancellation or directional control of the sound (like a wide-tele zoom
setting). The original positioning and wiring of the mics would be
important. It is possible to create cardiod/hyper cardiod patterns by
sticking 2 capsules back to back and then "mixing" the resultant signal.

[If you've ever seen studio mics with the omni/fig 8/cardiod switches, that's
one way they achieve it]

Did you wire the new capsules in *exactly* the same, and are you sure? The
wiring of the old ones may have been counter-intuitive, and you've
accidentally wired the new ones "intuitively", if you get me.

Did you get them in the right physical locations?

Have you mixed and matched old capsules and new, or replaced wholesale?

Have you still got the old capsules?

Any details on how the mics are wired (series, parallel, their own separate
inputs etc.) ?

Mike.
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Mike Brown: mjb[at]pootle.demon.co.uk | http://www.pootle.demon.co.uk/