Do not short your outputs! You would probably blow up your preamp. In addition I would be amazed if anyone can actually verify any benefit to short balanced inputs.
Thanks. That is kind of what I thought, just was not sure. I had one of those know it all electrical type guys over recently and he commented about the unused balanced connections needing to be covered or capped and I was not sure what he was talking about.
if you want to experiment, you might try terminating the unused outputs with 600 ohm resistors soldered onto the Cannon plugs (placed across pins 2&3 I think, but do verify that) pin 1 I think is the ground pin which wouldn't be connected to anything.
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