going with a pr you are not going to have enough volume for vented. (not with the rockfords. they do not sound very good in small boxes) with 1 10" then yes vented.
sounds like ur sub is f'd....same thing happened to mine when my mom's idiot bf decided it was a good idea to store a heavy bag right on top of the cone of my 18" custom tc sounds...never even got a chance to hear it //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif
go ported btw....single 10 sealed wouldnt be worth it imo...ull jus want more anyway....u'll have 2 18's ported by next year