Interconnects and non-believers

You should go check out what cabling is used in multi million dollar recording studios by master mixing engineers. The market is more or less owned by canare at a dollar a foot carrying weak microphone signals over hundreds of feet of wire. If it's good enough for them, it's good enough for me. I have a hundred bucks of cable in a $25K office setup. For all intents and purposes, audible audio signal might as well be DC as far as physics is concerned.

Teo, if you can hear in the 1mhz range, I'm calling the man in black on you, but on a serious note, you're selling snake oil. 250khz cannot travel more than a meter in air, 1mhz maybe a centimeter or two. Entirely not applicable to human hearing. You're trying to solve problems that simply don't exist. There are maybe 3 guys on audiogon young enough to be able to hear 20khz test tone.