Semi: What about XLR shorting plug? you solder both "+" and "-" to GND?That's a good question, and I'm not sure whether it would be more optimal to just short pins 2 and 3 to each other, or to also short them to ground (pin 1). A theoretical argument could probably be conjured up to support either approach. In practice, my guess would be that generally there would not be a perceivable difference between the two alternatives.
Regards,
-- Al