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My church wants to run a line level, balanced output from the back of the church to the front of the church (65')? Then, after running through a wall-mounted pot, on to an amp and then to monitor speakers.? The pot is so that the choir director will have volume control over the signal.
?How do I spec the voltage/amperage on the pot?

A gain control at speaker level would be better. I haven't done PA work in a very long time but I can't recall seeing line impedance gain controls as commonly available. You might check with a local sound company to see if they are available.

Jim