i see that baluns are available for audio over TP but they are about 30 bucks per mono channel...i think it is similar to the 75ohm to 300 ohm baluns of the olde dayes that was common on the side of the house to convert ladder wire to coax. they cost about 3 bucks so why are these audio baluns so expensive and could we use the old 4:1 ratio baluns from tv wire to do the job at a 10th of the cost???
