So right now I have purchased and have in my possession two JL Audio 10" w1v3-4 and will run them in series from a JL Audio JX500/1D. I am getting the RCA signal and remote turn on from the Net Audio harness and ANC bypass that I already installed this past weekend. (BTW so far I have noticed very little difference with no ANC but I haven't been on an extended highway trip yet either).
To answer your question, Right now the plan is to leave the door speakers being powered from the stock head unit and add the fore mentioned subwoofers and amp whenever I receive my fox acoustic box. This set-up saved me roughly $1200 over plan B which was adding the pac amppro ap4-ch41(r2) and powering all speakers off a single amp or dual amps. I decided to go with option 1 mainly because I don't feel that the volume of the door speakers is the main issue in my system but the lack of true low end bass is. The benefits of adding an amp is substantial and not only would these speakers get more power but they would get cleaner power and the ability to use either crossovers or an eq to tune the sound much better as well.
Right now I am planning on sticking with option 1, at least until I get the new rims, tires and leveling kit purchased that I have been eyeing. After that I may revisit my decision if I am not blown away by these upgrades but I also want to upgrade the rims/tires and that is going to cost me at least another 3500 as well.
And for the record, everything I figured out in the above post has been gathered by reading this entire thread at least 2x from start to finish and I want to give all the credit to the guys before me that really figured this mess out.
Link to the net audio harness for good measure.
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www.netaudiowf.com
And the pac am pro harness
https://catalog.pac-audio.com/catalog/amplifier-integration-harness/anc-ch01