You're such a phucking noob that you don't even know how to correclty identify the subwoofers you're wanting...jackass...
The sledgehammer is a line of pre-loaded subwoofer enclosures. The can come with 7500 series, 8500 series, and 9500 series...in all different sizes and numbers. SO, there is NO "sledgehammer" woofer...
DOUCHE!
nG