Just another bump; if anyone knows the stock impedance of the door speakers.

 

Your install looks to be very well done. I am always impressed with such attention to detail and caliber of workmanship.
I wish my hearing was acute enough to appreciate the differences I am sure your new system has over the old.
For now, The Duchess will just have to settle for the Alpine Premium system that came with her....and I shall just have
deal with the hearing loss that comes with history of being assigned to a battery of Howitzers.

 

Alpine door speakere are 3 ohm
base stereo door speakers are 4 ohms. I checked mine and they are awful quality and anything aftermarket is an upgrade