just keep in mind u could get 2 of the b2 but about same $ as 1 of these other to though.. my pioneer is $70 so when someone with $300 sub jokes about it i say well u maybe 2-6 db louder but i could get 4 of these subs for what u paid for 1., same true of lot of subs under $200.. if u going for jut sq u need smaller sealed box anyway if u want real loud especially with 500 u need ported box, so decide which u want later so u can get different box later maybe dual sealed get 2nd sub or single ported so get sub that'll work with what power u may get and what box u may have in 6 months., took me 3 months to get bigger amp..