In article ,
Jim Gregory wrote:
Has this lavalier possibly got an ancient 30 or 50 Ohm coil? This could
explain its comparatively low o/p. Don't go and measure it on an
analogue multimeter. If yes, you'll need a step-up, approx 1:3 xformer.

Sony were the originator of the small high quality personal mic - the
ECM 50. Dunno what ECM actually stands for, but rumour was electret
condenser mic. And I dunno again if they ever made a moving coil personal
- it doesn't make sense these days given how cheap an electret is.

--
*Money isn't everything, but it sure keeps the kids in touch.

Dave Plowman London SW
To e-mail, change noise into sound.