If you are talking about a W6 or W7 in an SQL setup, then kicker stomps them down all the time...I sold the W7s but for the price you can get 1 L7 custom box, and maybe even a cheap amp......In pure SPL I run 2 12L7 D2s in a vented enclosure and stomp W7s all the time....I can do mid 150s all day long with 1500 watts.....but on the other hand if you only want Sq then the W7 is better, but sence I sell selenium that picks up there....at uder 1/2 the cost of a W7.....so the W7s are great subs just way to over priced along with the new W6s....That is why we dropped the line....How would go into a store and spend 2 to 3 times the amount needed to get the same results......