Thanks for all the help!
I've connected a PAC SOEM-T to the rear speaker wiring, and ran a 12v directly from the battery terminal (not the distribution block).
I've connected the amp to the battery as well, but i haven't connected it to the sub.
I grounded it to one of the screws under the "false floor" in the trunk. There is 12.7v between the screw and the positive terminal with the engine turned off.
The problem is, I get a ton of static in my speakers when I switch it all on. The static disappears if I switch the fuse off. (I got a 100A rockford fosgate automatic fuse)
I also seem to have the opposite problem of other PAC owners. The remote wire from the SOEM-T is always live as long as it has power.
Edit:
Not everything is connected in the above picture, but it should show most of my connections. The SOEM-T is connected to the speaker wires hidden behind the left side shoulder support.
It is also grounded to the grounding connector behind said shoulder support.
The "permanent live" connector to the SOEM-T is connected to 12v positive on the amp.