From another room, or even outside the sweet spot, you may be hearing room reflections. My best guess.
Where s the bass?
Why does the bass sound so much deeper outside of the sweet-spot???? Even in the next room!!!! I don't believe this a shortcoming of any particular part of my system, but some sort of government conspiracy or something. I don't even care that it's not in the sweetspot, but why so much deeper elsewhere????