I think he said he has an Alpine PDX-4.100
Same one I use for the fronts in my Honda.
4.150, but I'm 99% sure the form factor is the same.
I used to run it bridged to a pair of dynaudio midbass... those were the days.
Okay here's the driver's seat all the way forward with the PDX4.150 in position. (which is a position the seat will never be in, as I'm 6'7) If I make a little cover for part of it, it will be 100% invisible.
So, I'm on board with that.
For my subs, I'll set up a molex connector and some way to get them in and out in a hurry if I need the space. (two ARC 8s)
My next big hurdle is the integration. I'm leaning toward a unit like the AudioControl EQS.
I can tap the leads for the front speakers. and use the Audiocontrol EQS to EQ left and right channels independently (by using FRONT as LEFT and REAR as RIGHT.) Because, honestly, Focals are going to need a
lot of EQ bounced off a windshield...
But there's no guarantee the EQS won't whine like crazy, and it's expensive at $250.
I've had issue with outboard EQs causing electrical noise when paired with the PDX before. Hmmm.
Also not sure what to tap for subwoofer output.