Those stray strands of copper need to touch to cause a problem. But if they touch the back of your amp, or other wires lay on top, the may eventually cause a short. Do you have Radio Shack in Oz? They carry a dual-banana plug, part xxx-308 that makes it easy to do a neat wire job. Buy one set...
I'm afraid your salesman knows little about basic electronics. The thicker/thin wire draws the same current. It's the speaker at the end that changes it's impedence and changes the current draw. Try running all 5 small, then try just the center as LARGE. And once again - check the wires...
Hi Robert. Welcome to HTF!
First, your speaker wire:
The longer runs of speaker wire should be thicker, not the short runs. Several speaker sites recommend the following based on the run-length:
1-10 ft: 16 ga
11-20 ft: 14 ga
20+ ft: 12 ga
It's not a power thing. A long run of...