well shit 9 cubes is deff enough space for that sub thats for sure, and ok yea rockford is underrated and mine is a little over rated but still....
umm you actually have the exact sub i was goin to start off with just bigger i was just stupid and got the q but actually it gets suprsingly loud you can ask nofearx18 i hit a 140.2 with it in the trunk so not to bad. and sence you have the space im glad your using it um are you doin sub up and port up or back?? just curious now, and your right it is a sq sub
and yea ask what ever you want im pretty new too, umm my electrical is doin alright its holdin in there um since my car is a 1995 i have no voltage guage but im goin to get one umm i no it drops cuz i can tell that slight difference from the first hit to the next and its not the sub that affects the electrical its the amp. and no i have a stock electrical for now i have two D925 batteries being shipped to me now ill have them coming to me soon with them and my current set up im hopin to hit a 140.6 not to much louder but its somethin you'll figure out how hard those extra little bits are once you compete. and yea i started out the same way as you with the budget and the mtx crap too. but now im lookin to do either 4 12's or 2 15's, i also might be gettin a new amp to push about 2400 watts rms and im running 12 guage rockford wiring shit is nice man trust me