Hi all im hoping somebody can shed some light on something for me, im currently going to run 6x9s from amplifier, havent decided what amp yet but im looking at my head unit and there's 3 pre outputs 1, which is subwoofer which im fine with the other 2 are rear output (std)/middle range output (nw) the other is front output (std)high range output (nw) which one would I plug into for 3 way 6x9 speakers please? Any help would be much appreciate. Thanks