But don't expect them to sound great in a small sealed box.
If you want to use the L7's in a sealed box you'll need to go above 1.5 cu. ft. per 12, otherwise you will notice alot of overhang and the transient response will suffer not to mention it will sound quite boomy with a Qtc above 1.00
Also ported will result in up to 6db with these subs also they'll sound quite good IMHO. Who told you to run them sealed at CES this year, i know most of the people who work at kicker and i'm really suprised to hear that they said that. However if SQ is your primary goal, then yes sealed is better, but you'll still have to use a big box.