Sundown audio sa-10 can get as loud as a w7 in a 1.9 slot port enclosures stuffed with damping fabric tuned at 37 hz dependenig on the viechle i have a 1997 thunderbird the 1 10 is a killer vs jl for 200 dollars less then the w7 u can get louder with 2 sa 10 sundown audio subs the jl is tight thougn i love it but if you ask me all subs can sound great you have to play around with boxes if you are a nerded like me