Re: Speaker Wire?
Never use a guitar-to-amp cable to connect your amp to your speaker(s). A guitar cord requires the use of a SHEILDED CABLE, to help reject Radio Frequency Interference (RFI, aka "noise") from entering the amplifier. Using a sheilded cable between amp and speaker can damage your amp.
Speaker cable is two conductor wire, without a sheild. It may come as "twisted pair", or lamp cord (aka "zip" cord). Some companies like Monster Cable have made big bucks by selling premium quality, large gauge zip cord for use in audiophile and pro-sound applications.
Bigger gauges are better, as are shorter runs.
I hope this helps.
Bill