So I've got 2 12" Kickers from a friend. They say "IMPULSE" on the front of them, and have a purple sinewave in the center behind the lettering. On the back of the magnet they're stamped "stillwater designs" I need some information as to the type of subs they are. Do I put them in a sealed box or a ported one? How much power would it take to make these hit? RMS data or other general info'd be nice.