So far, I've built one shiva sub and two AV15 subs. My friends and family know me as the subwoofer builder dude, and now they're asking me what they should put in their car. Truth be told, I have no idea what to tell them. Basically, I think a Dayton DSQ in a 1 cubic foot box looks best to me. But my friends and family don't want to cut MDF. Can they just buy a prefab box somewhere? And what about the amp? Parts express sells TONS of amps, but I have no clue about them. And what about feeding the sub a signal? All I know about is the RCA sub pre-out on the back of an HT receiver. I have no idea what you have to do when you're dealing with a head unit. I guess you have to use an external speaker-level crossover... or four of them? Do you have to re-route all of the wiring to the main cabin speakers because of this? What about wiring for power to the sub amp? Take it from anywhere? How do the DIY'ers anchor the sub to the car? Thanks!