pro-rabbit 5,000+ posts
Moderator
39 x 17 x 22 is only 6.9(ish) ft3The max I can do is 8.3 cu ft (39"x17x22) because I still want to get my spare tire out from the bottom of the trunk. But for one sub that is plenty, I mean I could have two but then my budget comes in. I have always done ported in the past but the local audio store has been trying to tell me that sealed is better when it's in the trunk.. I was dreaming up ways of porting through the rear deck but I know nothing about how subs perform in trunks except that I will probably be investing in a lot of dynamat.
I would say do 2 12s ported. You will be much happier with the performance.
2 SA 12s $390
AQ 1200D $250
Use the rest to buy wires and build an enclosure.