no you dont.. I'm sure a few of you are familiar with JB HIFI... cos I work there selling car stereos all day long... there are so many different ways you can set your BA/BF up... in short, if you plan on running 4 speakers and a sub (or a few subs) of an amp, get yourself an AUDIOCONTROL LC6.. it has 3 speaker level inputs, one for front, one for rear and one for subs. yes this is a problem because you only have front and rear.. all you need to do is plug in your front and rear speaker wires and it converts in to 3 RCA outputs, front rear and subs... they retail for $319, but hey if you live in the S.E. suburbs of melb and you want one, I might give you a discount (on any other stereo stuff aswell) anyway read about it here: (click on sales notes on right hand side - 1992kb file) LC6 INFO btw, any more questions - feel free to ask me