today i was riding in a friends explorer and i noticed some weird sounds from his subs. he said it was engine noise. he told me that it's because he ran his power cable and his RCA's right next to each other. that made me wonder. i have my RCA and Power wire both running down the left side of my car. my batteries on the left side. i figured just run them both down that side. i've never heard any engine noises or anything like what i heard in his car. so is that really what it is? or could it be something else?