Speaker Distance; Adjusting Speaker Distances With A Rotated Beam Direction; Adjusting Speaker Distances For More Than One Listening Position; Automated Measurement Of Speaker Distance - Bang & Olufsen BeoLab 90 Technical Sound Manual

Front
Right
Note that the beam directions of the
two BeoLab 90's in a pair are
independent, however, if you are
adjusting the Master loudspeaker's
direction, the Slave's direction will be
automatically adjusted to match. (e.g.
If you set the Master to Left Back, then
the Slave will also be set to Left Back.)
If you would like the loudspeakers to
be directed in two di erent directions
(e.g. Left Back and Right Front), you
should adjust the Master loudspeaker
first, and then adjust the Slave.
Figure 5.22: Conceptual drawing show-
ing the beam width of the Medium Beam
in the Left Front direction.
Figure 5.23: Conceptual drawing show-
ing the beam width of the Medium Beam
in the Right Back direction.
Note that, if an Active Room
Compensation zone has been created,
and is applied to the Preset you are
currently editing, then a appropriate
filter setting will be calculated each
time you change Beam Direction. This
calculation takes approximately 20
seconds to perform, and is indicated by
a progress wheel. If you wish to
audition di erences in Beam Direction
more quickly, this can be done by
disabling the ARC filter for the Preset in
the Room Compensation menu.

5.3 Speaker Distance

The Speaker Distance control is used to
ensure that the times of arrival of the
loudspeakers' signals at the listening
position are matched, despite their
being placed at di erent distances
from the listening position. The value
displayed on the menu should be the
distance from the listening position to
each loudspeaker. The result of this
alignment is that the closer
loudspeaker's signal is delayed to
match the time of arrival of the sound
from the more distant loudspeaker.
Note that, since the Listening Position
can be di erent for di erent Presets,
these distances may not necessarily be
the same from Preset to Preset.
Units Metres, Feet
Range (m) 0.0 – 10.0
Range (ft) 0.0 – 30.0
Resolution 0.1
Factory Default 1.0 m
5.3.1 Adjusting Speaker
Distances with a
rotated Beam Direction
If you are measuring the Speaker
Distances manually, then the
measurement should be made from
the listening position to the tweeter
associated with the Beam Direction as
illustrated in Figure 5.25.
19
Figure 5.25: The Speaker Distance for
each loudspeaker should be measured
from the listening position to the rele-
vant tweeter for the given Beam Direc-
tions.
5.3.2 Adjusting Speaker
Distances for more than
one listening position
In cases where there is more than one
listener present, the Speaker Distances
can be optimised by measuring each
loudspeaker's position relative to the
closest listening position, as is shown
in Figure 5.26.
Figure 5.26: The Speaker Distance for
each loudspeaker should be measured
from the relevant tweeter for the given
Beam Directions to the closest listening
position.
Automated Measurement of
Speaker Distance
The distance from the listening position
to each BeoLab 90 can be measured
automatically using the microphone.
This is done by pressing the
microphone icon at the bottom of the
Beam Control menu (shown in Figure
5.27) and following the instructions.