wiring 4 ohm and 2 ohm together

Sure, series wiring would be fine.  The amplifier will output into a 6 ohm load, and the front 2 ohm components will receive twice the power as the rears.

Run positive from the amp up to the front's crossover pos input.  From the xover neg input, run a wire to the rear speaker's pos terminal.  Then run a wire from that speaker's neg terminal back to amp neg.

All I have to say is "4-Channel".  You'll know what I'm talkin about when you get one.

Dalfe5,

You don't mow an acre with a push mower, when u have a john deere ride-on sitting in the garage.  You have a complete system that is pretty much matched up.  Why are you trying to manage with less components?  Its less work, not to mention less risky, to just throw both amps in at the same time, without worrying about managing connections, if or will it work? how well? how loud? how long?

I'm not trying to discourage you from reaching your goal, which at the far end I would imagine is great sound.  I would just hate to see you deprive yourself of what your amps can give you and with the same or maybe less effort than how you are trying to get it done.