Mr big - welcome to the forums.

You have a couple of choices but to me, in the end there is really only one that makes the most sense. Some people want to maintain L and R in there boat and keep fader control ability. But it makes more effective use of the fader to run the speakers in the bow off the front section of the amp and the cabin speakers off the rear section of the amplifier. This gives you the ability to isolate sound.

Say you have a child or friends with kids and they want to crash for a bit. No problem, have them lay down up front, and then fade the system to rear and it effectively isolates that section. Most tower speakers are pointing to the rear anyway, so you are creating a quiet zone.

As for wiring, this means your amp will be running a 4 ohm load on the front section (1 pair of speakers), and the rear section will be running a 2 ohm load (2 pair of speakers).

--- side note: make sure you have your crossovers on the amplifier set to HP or high pass mode so you have the amplifier sending frequencies that are appropriate for the 6.5" speakers.

- Brian
Exile Audio