i think it generally depends on the box its self.. and how well its made.. some enclosures are lose and so ur amp Die soon from box ratteling befor flexing itself..
b4 goin for other sub.. try changin the position of ur box.. from Left to right..
facing Up wards.. back .. front ... it differs.. unless u lookng for huge difference..
it depends on the type of install.. what amp u using and how many subs... and what is their resistance (check with Amp )
Dual voice Coils give you more options on installs...