Obsidian Audio 15 D2 OR SA-15 D2. Hurry up and reply quick if you do, because as of right now I am planning to buy a Mint Condition OA-15 D4 this Friday. Condition of the subs must be in very very good condition, no damage, no damage to surround, cones or nothing. I plan to bump with the sub for 3-5 years, so I don't want crap. The newer the better. Name your price and if I'm interested I'll PM you.