Does the Kicker L5's sound better than this?

[HardHitter]

Well, right now I have a concept cse-12 12" sub, in a prefab bandpass box and an autotek 200.2 watt amp going to the sub. If I bought two 15" Kicker L5 subs, and put around 600-750watts on each sub, would the Kicker L5's sound better (as in SQ and SPL) than my Concept CSE-12? I have yet to decide if I want to put the Kickers in a sealed box or port them, but what do you guys think. Any comments and suggestions would be welcome. Thanks a lot.

[Azn_Phyta]

Bandpasses sound like poo unless they are made perfectly...I would keep the L5's sealed...You will still have plenty of spl with them sealed...