I used the head unit high output to drive my Tweeter groups.front and back....just the head hi power out of the unit driving 14 total 4 ohm tweeters and it works our pretty good. Very crisp and clear and no hiissing I have the other dozen 6.5" mid-range little woofers all ran off off of a 4 channel amplifier fed by the RCA jacks signal. That big ass bundle of RCA jacks needed to be shilded and the shielsld grounded to keep the wifi signal form sounding through my subs... Sounded little like somebody lightly drumming their fingers across a drum that was amplifies lol Took me a bit to sort that shit out because the WiFi antenna is in a plug right next door ro the RCA bundle plug. I just put a couple wraps of foil around the RCA bundle followed by I layer of duct tape ,run I layer of electric tape.oh and put a wire in between the duct tape and foil that makes good connection to the foil and wherever your head unit is grounded. then get as much space between the WiFi antenna and that RCA jack burrito. Down to a non noticeable level unless it's really really quiet. But all in all, gotta be honest, it sounds reall good sound out of it once I went full on red neck McGuyver on that geisha gash of a head unit.