Thanks for the feedback. I was thinking of using the long runs based on a
thread you commented on. I am thinking of using a Benchmark LA4 preamp,
which I think supports the balanced standard as you described.
@yyzsantabarbara I would not leave that bit about the balanced standard to chance or assumption! Ask them if the unit supports AES48. They should reply with a 'yes' or 'no' without obfuscation.
The tricky bit that most manufacturers have is the part about how the balanced line system ignores ground and as a result how the output of something like a preamp **doesn't reference ground** in order to work. So if they seem uncertain if the standard is supported, ask them if it will work if only a twisted pair is used to conduct the signal, using only pins 2 and 3 of the output. If they say 'no- that will cause a hum or buzz because pin 1 isn't hooked up' or words to that effect, then you will know that the standard is not supported. I looked at their website, but information like that wasn't available.