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Boundary Coupled Bass (BCB)
By placing the 8c's close to the front wall*, the two
rear-firing subwoofers of the 8c can be used in
boundary coupling mode. When the 8c and the wall
are acoustically coupled, the two will effectively act
as a single source. In the 8c Boundary Coupled Bass
(BCB) has three advantages:
•
Boundary coupling avoids the destructive
interference between the speaker's direct
sound and the boundary reflection.
•
Low frequency headroom is increased by up to
6 dB.
•
Increased directivity in the bass, for a good
directivity match between the Boundary-
Coupled Bass and the cardioid midrange.
With
conventional
coupling has significant drawbacks. That is because
placement close to the wall negatively affects the
sound quality in the midrange. In the midrange
the front-wall reflection will cause coloration and
smearing in the time-domain. The problems in
the midrange do not outweigh the advantages of
boundary coupling in the bass. However, thanks to
the high directivity of its acoustic cardioid cabinet
and its internal Digital Signal Processor the 8c can
take advantage of boundary coupling and retain
perfect clarity in the midrange.
For boundary coupling to work best, place the
8c between 10 and 50 cm from the front-wall.
Placement within this range of distances will result
in a maximum increase of headroom by up to 6
dB and a phase-coherent first-wave front without
smearing in the time-domain.
When the 8c's are placed farther than 50 cm from the
front-wall, there will be some time-smearing of the
wave-front, caused the gradual falling apart of the
loudspeakers,
boundary
Distance range for boundary coupling
acoustic coupling between the 8c's subwoofers and
the wall. Although front-wall distance presets will
correct for part of the negative effects of reflection,
as you move the 8c farther from the front-wall, you
will progressively lose the benefits of BCB.
You can further flatten the in-room response with
the parametric equalizer if necessary. Dutch & Dutch
recommends that you use in-room measurements
to properly optimize the equalizer settings.
Generally speaking, the closer to the wall, the
better boundary coupling works. However, the
subwoofers need some free space to operate
properly. Therefore, make sure that there is at least
10 cm between the rear wall and the rear of the
cabinet.
14
10-80 CM