Arc: Active Room Compensation; Performance - Bang & Olufsen BeoLab 90 Technical Sound Manual

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Front
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Figure 1.9: BeoLab 90 has five beam di-
rections available, allowing you to opti-
mise for di erent listening positions.
1.1.3 ARC: Active Room
Compensation
In 2002, Bang & Olufsen introduced
the BeoLab 5 which included ABC –
Automatic Bass Calibration. This was a
system that used a microphone to
measure the e ects of the listening
room's acoustical behaviour on the
sound of the loudspeaker, and then
created a filter that compensated for
those e ects in the low frequency
band. As a simple example, if your
room tended to increase the apparent
bass level, then the BeoLab 5's would
reduce their bass level by the same
amount.
BeoLab 90 takes this concept to a new
level with its Active Room
Compensation or ARC. Using an
external microphone (available from
your Bang & Olufsen dealer), you can
measure the e ects of your room's
acoustical behaviour in di erent zones
in the room and subsequently select
optimised compensation filters for
di erent situations. For example, you
can customise a filter for the sofa, and
another for your dining area. In cases
where you are moving between these
locations, you can simply select a
combination of both filters to create a
single compensation filter that
improves the sound experience in both
locations.
The BeoLab 90 also o ers another
development in acoustical room
compensation: multichannel
processing. This means that the
loudspeakers not only "see" each other
as having an e ect on the room – but
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they help each other to control the
room's acoustical influence.

1.1.4 Performance

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BeoLab 90 has been designed from the
outset to deliver an unparalleled audio
performance. Measured directly in
front of the loudspeaker, it has a
frequency range that exceeds the
limits of human hearing at normal
listening levels as can be seen in the
comparison plot in Figure 1.10. (see
the Technical Specifications
details).
for more
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