Because we special-ordered our 2007 2350 without a slide-out and with a dinette, I had the factory place the sub in the front dinette bench instead of under the bed which in our case, increased outdoor storage by that much.
I don't recall how the sub is wired, if it has plug-in RCA jacks, or if it is hard wired. I want to say hard wired but I can check if you want.