David, if I may chip in...

Try this technique. At one end of your long interconnects, connect one conductor AND the shield to the ground of the plug, but at the other end, connect ONLY the conductor to ground.

In other words, the two-conductor-plus-shield cable should have the shield connected at only one end. (This actually helps reduce noise and hum, but as it was pointed out by Thon, the twisted-pair trick is best used where your input stage is balanced for common-mode rejection, which means that the input stage ignores signals that are of the same polarity, and only responds to the difference signal, what is 'different' between the two conductors. This is why the pros use the Canon-type (XLR) 3-pin connectors: +, -, and ground.)

Which end? It's usually done so the shield is connected at the component being fed, but the best idea is to leave enough slack so you can try it both ways.

Larry
www.fineelectricco.com

This message was edited by Larry Fine on 12/14/01 18:04.54.