Hi gang. I have an Ampeg PF500 and 2 115 cabs I use with it. They stack, and I have cables that are just long enough to reach when stacked (with a little slack, of course). I'm thinking of placing the 2 cabs about 20 feet apart for an upcoming gig, to really rumble the room. What's the longest cable I should use? In other words, will I lose any signal or power by doing this? I know it's a dumb question. I know very little about amps, surprisingly.