i've got a modest 8" (audio-pro evidence) sub, and i feel very uncomfrtable crancking the volume on it!! i live in an apartment building, and this thing shakes the floor like a ... small earthquake! really, it's not social! i havent got complants yet and im keeping it low. i dont want them to knock on my door...(yikes) so how can i make my life better with a bigger sub, if i cant even use this one?? any liberating insights on the matter people?