I'm looking for ~20' of coax to run from my source (emu 0404) to my dac. I've currently got some cheap stuff from monoprice - is the stuff bluejeanscable sells significantly better? Other sources for long runs?
For such long runs, I strongly suggest that you look at Monarchy Digital Interface Processor (DIP) which boost the digital signal and dejitter too. Those are arround used for as little as $100. It would make a dramatic improvement in sound.