Now that I've almost completely finished my car audio upgrade, here are some pictures and information about it.
... My truck originally came with the B&O sound system with 8" Sync 3. I installed a NavZen as the signal converter, and from there I connected via RCA cables (the signal level was too low with SPDIF) to an Audison Forza 12.14 amplifier. The Audison M1D is connected via an AF Link cable for the Subwoofer.

The front speakers were converted to a 3-way system, and for the A-pillars, I was heavily inspired by @SoundsGoodStereo












. I installed Hertz ML 280.2 tweeters, Hertz ML 700.3 midrange drivers, and Hertz ML 1650.3 woofers. The doors were soundproofed, as were the rear wall of the cab and the area of ​​the floor where the subwoofer will eventually be located.

I'm using two Hertz MPS 250 S2 subwoofers, but I still need to build the enclosure for them.

I ran 50 mm˛ power and ground cables from the battery to the rear and added a 20 Ah backup battery. The AGM battery is installed under the rear seat.

I still need to decide whether to connect the rear door speakers; currently, they're connected but not configured. If I decide to do that, the rear doors will need soundproofing, and then I'll probably install some Hertz coaxial speakers.

Right now, I'm going to focus on the enclosure for the subwoofer because the single ARC 8 that's currently in there is far too weak.