a friend that did multitrack to 2 track stereo studio master work also worked at several audiophile (including Christopher Hansens) stores in la. as there were audible differences between amps and speakers there were small audible differences between cables. we even experimented with our own cables and he liked 2 rg6 catv cables for speker wire. i like 10 gauge because the bass is a little stronger and i have dynaudio 30w100 woofs that can handle 300 watts rms. i use fine stranded automotive power cable because its very flexable and the insulation is tough. my stereo is powered by a qsc 3500 that rated 300 watts into 8 ohms and i crank it up.
my firend and i did a lot of comparisons between conrad-johnson , manley(used in lots of recording studios) , audio research , vtl , cat , mit cable , kimber cable , monster cable , and other brands of high priced junk. save your money and buy zip cord. if you crank it like i do use 12 or 10 gauge. i use canarie star quad and make my own rca interconnect cables.
for a home stereo 12-14 gauge zip cord is fine. the larger gauge seems to have better bass and just for you guys that might mock me , i am a drummer , sound man , recording engineer and can easily make a recording and compare it to the real instrument.