First of all, I'm somewhat of a stereo noob so please bare with me.

Here's my current equipment (stock 2008 LSV):
2 - Kicker zx200-4's
6 - main cabin speakers
1 - 10" sub under the helm
2 - Roswell FCT tower speakers

And how it's set up:

One kicker zx200-4 is powering the 6 cabin speakers. That in itself is a mystery to me as it's a 4 channel amp powering 6 speakers? Maybe someone could shed some light on that...

The other kicker zx200-4 has 4 of it's leads powering the 2 Roswell FCT tower speakers (i.e. 2 leads or one speaker wire per speaker). 2 more leads, or one speaker wire, is powering the 10" sub under the helm. And the other 2 remaining leads were powering a kicker box that was in a rear locker of which I've removed and don't plan on using.

So, I want to add a pair of Roswell R6's to the tower so I'll have four tower speakers. Is there a way to run the four tower speaks utilizing the existing 2 speaker wires (4 leads) that are currently in the tower? Or do I need to run more wires? And, how do I wire the amp for these new tower speakers?

Thanks
Steve