DB 12 for a average room 2nd choice a WO.
DB 12 goes lower than the DB10 as far as I know. I would say at least 10 hz but I have never measured it.
night and day between my DB12 and DB10 and same brand sub.
plus the DB12 is much prettier
I may build another out of baltic birch one day instead of MDF. I really like the looks and sound.