firing sub into cabin. Makes a difference?

[SHiZNiLTi 10+ year member]

I'd build a 4th order and have it ported into the ski pass hole. That way there's less chance of any trunk rattle.

 

[SSS 18734 5,000+ posts]

You can seal it off and still be able to pass your skis through. You'd just have to build a slit down the middle with a removable plug. Pretty easy.