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"tie pin-3 to pin-1 of the XLR-3M" meaning

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Just looking in the Sound Devices 633 manual and noticed this on page 29:



For unbalanced connections, tie pin-3 to pin-1 of the XLR-3M connector of the cable.


What does this mean? Are they advising that you somehow add a connection between pins 3 and 1 of the male end of the unbalanced XLR cable. If so how do you do this.


Many thanks in advance.

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This is typical for connecting an unbalanced signal to a balanced input.


Take a piece of wire and solder it from pin 1 to pin 3. I use the extra wire attached to a resistor.

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