i had 4 12" L7's in a sealed box on 2600 watts, i had 2 alpine pdx m12's. i got rid of the L7's about 3 months ago. today i traded one of my amps for 2 10" alpine type x's in a slot ported box and some cash in my pocket. its a box built to specs, not sure the volume. im interested to see how loud these 2 10's can get on 1300 watts. i know it wont be as loud, i have half the power and alot less cone area, but i should make a little bit up with the ported box.