Should my subs be bottoming out?

okay, i have two type r 1222d subs hooked up in a sealed enclosure to a mrp-m1000 mono amp. Should the subs be bottoming out during the bigginning of 'pop my trunk' by lil wayne... during the deep base parts? i have no problem with bottoming out during the higher, harder hidding parts, but the deep parts kill me.... i thought the type r subs were supposed to be able to take a lot of bang? please help... Thank you