"Alan Rutlidge iinet.net.au" rutlidge@NO_SPAM wrote in message
...
The reason why the Shure transformer probably came set to 600 ohms as the
default impedance, is that 600 ohms is a common impedance for professional
equipment using balanced circuits.

Thank you for the explanation.

The method behind the madness of a solder joint over a switch is well
founded. In your case, a low level microphone (tens of millivolts) and
having no d.c. present on the circuit, a switch may become noisy over time
and lead to more annoying problems.

Now I understand; thank you. I'd STILL like to know why Shure doesn't
include those soldering instructions in the device itself when shipped. If
you hadn't clued me in to Shure's web site instructions I'd never have
known.

Now all you should do is add a sticker
to the outside of the case saying "set to 150 ohms" so any other user does
not think it is still on the default of 600 ohms.

Thoughtful but probably not necessary. I live alone and if anyone else is
using this device I don't know about it!

Cheers,
Charles