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Go right to the head unit. Then either shut all lows off from the head unit and boost at the amp or use in-line level filters to make sure only the sound the speaker is made for is getting through to it.What is the best way to hook up the mids and tweeters? Just straight off the H.U.? Or could I just splice them in to the rear speakers (not the subs) or do they go with the subs? I have no clue
That's why I mentioned the inline filters in my initial post.You can hook them up if you just install some crossovers to direct only high frequencies to the tweeters. And you can hook them up in series with your front speakers so you won't damage your head unit. (hook left tweeter in series with left front speaker, right tweeter in series with right front speaker.)