Decades of live sound work doesn't presume you've heard a good cable.The whole point of going balanced is to get off of the exotic cable merry go round.
Imagine a technology where a $100 cable can sound as good as a cable that's $1000/foot. That's the balanced line system. So in effect, if one has been doing decades of live sound, the cables have worked as well as the best out there for the simple reason that the balanced line system works that way.
One caveat: pro audio gear supports the balanced line standard. Most high end audio stuff does not. In order for the cable to not have a sonic signature of its own, the equipment must support the standard. In a nutshell, here it is:
1) pin 1 is ground, pin 2 is non-inverting, pin 3 is inverting2) the system is low impedance; the source must have the ability to drive 1000-2000 ohms without worries3) the system ignores ground (pin 1); no signal currents are passed through the pin 1 connection (shield of the cable). This is where most high end audio stuff misses the mark.4) the impedance to ground from either pin 2 or pin 3 is the same.
5) the signal travels within a twisted pair usually within a shield.