Hi sifus, was wondering is this set up cacat? As i cannot find any topic about this. Putting the tweeter and mid bass at the rear while 2 orginal speaker in front? Thank you for ur reply

Well certainly it's cacat but if you liked the sound no problem la. Mostly people do front setup 2 or 3 way because yea it's very efficient. I too was planning to do twin system in my car where 2 way DLS K4 at OEM position and add another entry level high end 3 way custom build. It'll be a tuning nightmare. Well to be exact no one wanna tune the car really. Troublesome

depends on what u want, if u just want to listen to nicer music, anything also can, if u want soundstage n etc... then different story...