It seems like it would be, but I would call pac and ask before you buy to be sure.
i don't think they are, since rear deck are just bass ... i think if you put full 6x9 there you have to tap into your rear door if you want both freq. so maybe front door and rear door are tied together...?either way i believe the audio system is setup as a four channel. The speakers in the rear doors and rear deck are tied together.