Technically, the rear door speakers and rear deck speakers are still powered by the Bose amp.

I left them hooked up in case someone is in the back seat and wants to hear music.

95% of the time, the fader is set all the way front so I do not have to hear the rear door speakers. The rear deck speakers add a little mid-bass fill.

I prewired the rear doors with speaker wire from the trunk. I also ran a second set of RCAs from the head unit to the trunk. If I decide that I am using the rear speakers more than expected, I will add a little 50wpc amp and some Focal 5 1/4" co-axs. Or, I will add a mono sub amp and use my 75 wpc x 4 for my doors (I think that would be overkill for the rear). Everything is ready to plug and play.