Sennheiser DSP 360 - Manual (Page 17)

17
THE RIGHT PLACE FOR LISTENING
Optimum reproduction is only to be found at one point in a room, and it is
only there that you can hear the virtual 3D sound of the DSP-360.
The correct listening position and the correct loudspeaker position are in a
ratio of about 3:5.
EXAMPLE:
Your loudpeakers should be about 3 m apart and the television should be in
the middle. You should then take up your listening position about 5 m in front
of the system.