Are there any reliable Tube Subs out there? Like the size of a 2 liter coke bottle? Im kind of just looking for a little bump, nothing real serious and want to keep space in the trunk.

the smallest i know of are those bazooka tubes. they come amplified and unamplified also

Ehh, are the unamplified subs any good?

my friend used to have a tube sub wired up to his home stereo it sounded good to me but ive never heard one in a car but they have been around since the 80'* and their still around so the must be doing something right, the not gonna make ur car super loud but it should help in the bass area.

for cheap bass they are Ok but dont expect much out of them

umm dont go for it. not worth it if you want to bump. made more for mids and doesnt hit low notes well. if you wanna go for a small sub go for the infinity bass link. it has a built in amp and box. it hits lows better than most crappy tubes and puts out 200 watts. my dad has one in his truck its pretty nice for such a small unit.

Ok, I will look at the Infinity. I just want a little something and want to keep space available.