quality of the wires.... as long as you're not buying wires that werent made to the specs of RCA wires and have protective jackets, they're all the same. Only big difference is the gauge.
Lawl... Clippity clip clip clip is how 99% of people run their sound systems when showing off.
Check your voltage loss, because thats what happens when you run a lot of current across a small wire.
Cars are just ****ing retarded and run off of 12V/14.4V so the second you get reduced voltage you're losing power.
half a volt at 100 amps is 50 watts lost to the power cable.