I'll bet there's a specific frequency that matches the resonant frequency of the house and with 1 milliWatt, the whole mess will shake apart into dust.
BTW I'll be moving in 5 years and the new place won't have a cursed A/V room. By then though I may be crapping my drawers and babbling (more) incoherently so A/V may be the last thing I need.
House of the Rising Sone Out in the mid or far field Dedicated mid-woofers are over-rated