You should invest in an lc6 with bass control and fit it between the head unit and amp. Wiring the fronts and sub all of the front is the best way to go for many reasons. One, with the rear speaker only running of the deck you would have to splice into the rears to run the sub effectively halving your signal which means you have to turn up your gain giving you more distortion. Two, you will have a far more balanced system it you wire it up as follows. -Head unit front speakers to lc6 which allows you to split the signal into fronts and sub (you can also control rca voltage and stop cliping at the lc6 before it gets to the amp allowing you to turn the gain down on the amp giving better SQ) -Lc6 to amp with rca's (amp must have built in cross-over) -Amp to speakers -Rear speakers from deck Wiring this way will allow you to tune the system properly. Set head unit to rear only, turn volume up until the speaker start to distort and than come back one notch. This gives you the maxium head unit volume. Now set head unit to the fronts (disconnect the rca for the sub at the amp first and turn the gain right down), than turn the volume up to your head unit max and start turning up your gain until your happy. Now turn volume down (disconnect front speaker rca's and refit sub rca's), turn volume back up and adjust the gain. This is a very good starting point now you can adjust the base using the remote sub control from lc6 and play with your coss-over point and you should be right. Chalkie.