ive always run 8 guage wire lol. never ever had an issue running every on one side. why is that? but i know its a common no no but i do it anyway bc I never had issues. my systems usually only consist of 1 300 watt sub amp and 1 100 watt 4 ch amp. but now I jus have the sub amp. is is cus my system is small?

 

or you may just have shitty speakers

ive noticed things like interference sound much worse on nicer speakers . all of the shitty youtube rips i had on my ipod sounded fine on the speakers on my blazer. then i upgraded and realized how shitty they were and how bad the quality of the music was

 

I always ran the power down one side and the RCAs down the other. There is a much lower chance of getting any interference.