Can you have a 4 channel amp and run the front stage at 2 ohms and run rear channels at 4 ohms?? For instance, i was wondering if you could have the Arc Audio 4150-XXK and run a set of chameleons up front at 2 ohms (2 x 160) and run a set of coaxials in the rear at 4 ohms (2 x 80)?? Thanks in advance for the help.