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Section 4 - Positioning
The LS-77 Reference Class Professional Monitor is a Transmissionline port loaded loudspeaker design with no
unusual or extraordinary positioning demands, neither in stereo nor in multichannel applications. Despite this,
every room will typically have its own particular sound characteristics as shaped by its own acoustic properties.
Rooms are also shaped, decorated and furnished uniquely, and therefore remain quite independent regarding
options for positioning loudspeakers. AMR suggests that you consult your experienced AMR retailer for further
assistance if needed. The following steps are general suggestions that will optimise the speaker placement.
4.1 Symmetry and room modes
It is preferred to establish a loudspeaker layout that provides an adequate and equal left/right image. The basis
for this symmetry, meaning that the distance from the listening position to the left and the right speakers should
be identical; and if not listening in the near field (1m or less), then additionally identical distance to the side-walls
should be maintained.
In all normal rooms certain low frequencies will be boosted or reduced by standing waves developing between
parallel walls. If the speakers are placed directly at walls or at half way or quarter way between walls these
standing waves will influence the speakers’ performance to the largest extent, hence such placement is best
avoided. Equally, it is preferable to locate the listener not at any half way or quarter way point between parallel
walls. You may also wish to review the material in Appendix F - Acoustics Background Information for more
details.
4.2 Distance between the loudspeakers
AMR recommends a distance between the speakers from slightly less (closer together) to slightly wider (further
apart) than the distance from the point centered in-between the pair of speakers and the listening position.
The closer the listening position is in relation to the loudspeakers, the closer the speakers need to be positioned
to each other, though as a starting point it is recommended that the speakers be about 2.0 - 3.0 meters apart from
each other.
Always try to
place the speakers
symmetrical in the
listening room.
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