Let me be perfectly clear: I need to see thru the cable hype. What EXACTLY are amp-preamp (pre/pro) connections? 75 ohn coax cable; audio analog wire (like RS Gold, say), or what. I mean, what's the BASIC electrical construction here? I am asking because I have always had receivers. Now, I'm getting plenty of input about silver this, silver that cables, like $200. I need to know the "Home Depot 12 gauge" version for separate-to-pre/pro wires!