Staub Electronics ES-SUB-WIRELESS EPISODE - WIRELESS SUBWOOFER KIT - Manual (Page 4)

SUBWOOFER PLACEMENT
Subwoofer placement can have an effect on the overall audio performance in
your room. All rooms are different, but the strongest output will likely occur if
the subwoofer is placed in a corner of the room on the same wall as the front
channel speakers. This is known as the boundary effect and will emphasize
certain bass frequencies while canceling others. Some listeners will find this to
be the best sounding result, while others may find it overly “boomy” or muddy.
Once you have paired your wireless kit, you may want to experiment with
subwoofer placement to find the location that delivers the best performance.
Recommended placement of subwoofer in one
of the front corners of the room.