x2, but i have a ssd and i have heard a 15" l7 and mine walked all over it in sound quality, but, both subs were in ported box, his was prefab, and mine was custom, about the same output and my ssd is 12" if you're going to go sealed, i choose the q, ported, you could go either or depending upon your tastes What size is your SSD, how much cubic feet do you have on each sub. And whats the port tuned at??THNX