Buck 5,000+ posts
little alien on campus
The Brahma seems to be an awesome sub. I would orient the box with the port facing backwards and fairly close up to the hatch. A lot of times there’s a golden zone there with the port away from hatch distance. You might build a box facing everything rear, the 15 and port, and I would make it really wide from side to side. Regardless, I would definitely fire the port backwards and push the box up within a few inches of the hatch.
OP I just wanna give you a box idea. This box is for a Skar VXF, which would be Skar’s “SQ” sub, if they had one, lol. The shape of your box can be made to design pressure zones, to an extent, in your vehicle, to help the rear wave of the woofer load better in the box, and to control the flow of energy from out of the box to your ears up front:
I know that box is somewhat silly complicated for a ported box, but it’s like that to attempt to help flow the sound in a specific way; just an idea for you.