My guess is your speaker placement is in conflict with your room. Your sweet spot may be in a node of negitive bass frequency. Please tell us your room size and where your speakers are in the room, side wall dimensions and rear wall dimensions. Also tell us where your sweet spot is located (dimensions)
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????