One key that I forgot to mention was my apparent wisdom (quite the rarity I'm afraid) of keeping plenty of length in the speaker wires and RCAs.
Thankfully, I had enough length to reach the front of the trunk so it wasn't necessary to re-run any of the wiring. I had already run 12 gauge speaker wire back in '12 or '13.
When I originally did the wiring I used the plastic tubing. At first it was ok but over time it looked cheap.
This time I decided to wrap all the wiring with a product called techflex.
Link to more info:
https://www.techflex.com
It comes in a variety of colors and sizes. It's readily available from Amazon.
I wrapped each speaker wire in 1/4" techflex and 1/8" for the remote wire. I used 1/2" on the 4 AWG power and ground wires.
I then wrapped the individual wires and the RCA cables in 3/4" tech flex split loom.
In order to make the wires between the cross-overs, speakers and sub where they could be easily disconnected I used these quick disconnect wire ends. Also available from Amazon.
MCIGICM 10 Pair XT60H (XT60 Upgrade) Male Female Bullet Connectors Power Plugs (10 Pair)
These require soldering so I had to break out the old soldering iron. I also used the wife's label maker and some clear shrink wrap.
Finished product - 4 speaker channels + 1 sub channel + remote lead.
