no point in low passing 6x9's if you have a sub...mine atm are running normal (no high/low pass) along with my sub, sounds pretty good. with my new splits up the front it sounds a hell of a lot better, but my rear speakers are nothing special.
i didnt know that 6x9's were made like subs, by that i mean to run in sealed/free air...can you port/bandpass them aswell for something different?