I've been doing this insanity 4 a long time now. These are 2 key items 2 keep in mind:
1) ALL wires and cables should ALWAYS be able to handle the load it feeds 2 or from regardless of distance. Eg. 18 guage power cable 2 feed an amp with a 3000 Wrms output can only do 2 things, under power your amp and burn your car down.
2) In Ohm's law, lower resistance =higher load/output.But some people may not know this also means higher power draw/consumption.Eg. If 100Wrms @ 4 ohms
uses 16 amps, @2 ohms you'd get approx.140Wrms but you'd be using close to
Hope i helped someone.