I have a pair of 6x9's that require 75W rms. I have a sub that is 200W rms. If i were to buy a 600W 4 channel amp that is 2 ohm stable, and produces 100W rms for 4 channels and 300W bridged at 4 ohms could i have my pair of 6x9's wired one channel for each then bridge the sub for 300W? would this work?

 

Once the sub can be wired to 4 ohms, then I see no problem.