heres a thought...maybe with the new top....the character of the sub is changed...i know tc sounds tryed to make the sub as close to the original as possible...from the little info they had 2 work with...maybe the sub dont need a box that big or maybe it doesjust a thought
as far as amp settings.....did u set your gains using a 50hz test tone with all bass levels on hu and amp at lowest setting?
if u didnt do that u might want to try it..i know some1 who set there gains on a 20hz test tone and he said it got loud but for what he has it should be louder....so i told him the proper way is to set it on a 50hz test tone ...once he did that he notice substantial increse in output....just a thought
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