upgrading audio system

[shockwave20]

I have the 14 speaker system in my 08 m35. I plan to replace my 4 door speakers and use a small 4 channel amp to power them. I cant seem to find the door speaker size anywhere. I am going to use the audio control lc7i. 2 channel will go to the sub amp and the other 4 channel will go to the door speaker amp.
I am thinking all radio functions will remain the same except for the balance of the surround sound system. My gold is to increase the loudness. I currently have a kicker kx650.4 that I would bridge for the 2 subwoofer. Am I missing anything?

[shockwave20]

I found out the 4 door speakers are 6 1/2" @ 2 ohms. I have the 14 speaker system and also found.d out that full range frequency goes to all door speakers and tweeters. The tweeter have a capacitor to filter out the low frequency. All of the 7 surround speakers gets mid and high frequency.
Only the front door speakers handle the voice navigation. The front tweeter splice off the front door speaker. In two weeks I should finish my system