Hi everyone, newbie here, this is a great site!

Just upgrading the stereo in my 05 Mobius LSV and looking for some advice.

Here's what I have to work with:

Kenwood KMR330 head unit
JBL MA6004 4 channel amp
6 Polk DB651 speakers.

Since I need to drive 6 speakers, but only have a 4 channel amp, I'm wondering the best way to do this.
I know the left and right rear speakers are run together from the factory but that seems cheesy to me.
Would I be best to run the 4 rear speakers off the amp and the 2 bow speakers off the head unit? Or is there a better way to maximize sound quality with what I have?

Thanks for any help,
BB