I have two MK-350 subs and yesterday i moved one from one side of the room and stacked it on top of the other (the manual even recomends this). They are now in the corner next to the left stereo speaker and if i pointed them into the room they would be difficult to adjust and even turn off and the fact that the things are quite heavy. The sound is a lot more powerful from when the other sub was next to the right stereo speaker (not in a corner), even the anti-mode 8033 was having difficulty bringing that one in.