I wouldn't go so far as to say they add "noise." Have you ever ran Jensen? And its funny you mention wire. I run 4ga and my entire set up is made up of 6.5 component set up front and 6.5 coaxials in back, the 5 channel amp and 1 sub and even turned up most of the way, AC on high and my high beams on, my headlights still don't flicker when the bass slams(and it does slam) Maybe you've had a bad experience in the past but my amp came rated. Even a little certificate. Which I thought was funny. I'm just sayin, my component set came with a matching 5.25 coax and it cost me 90 dollars total and they sound great. Money isn't everything. Specs and materials. Not to mention sometimes you just gotta gamble, especially when there are no user reviews.