Seems like every time that I owned a down-firing sub, it only got me into trouble. Living in an apartment on the 2nd floor leaves much to be desired. Not to mention, the apartment manager lives directly below me. When I owned the Mirage S10 and/or S12, neighbors were always calling the police on me. Locally, we have a noise ordinance and have had to pay fines a few times. The thing is, however, I never played my sub very early of the morning and/or late at night. As such, I tried to be mindful of my neighbors.
Cheers,
Phil