Focal Utopia Be Series, User Manual

Page: 27 / 40

Box enclosure mounting
The correct acoustic load, normally
the type of enclosure and volume
made available to the subwoofer, is
of prime importance for maximum
performance. All pistonic acoustic
devices require a defined acoustic
load to work correctly. This means
type of charge (sealed or bass reflex)
and volume must be chosen wisely,
to gain maximum performance. Sealed box enclosure
Utopia Be subwoofers have been
carefully optimised to work in sealed
box enclosure. This type of enclosure
ensures sub bass frequencies
remain full and controlled. The
available excursion of the sub is
far more stable, for controlled
linearity limiting distortion, ensuring
maximum performance is main-
tained. The added benefit of a
properly defined sealed enclosure,
is that it remains comparatively
small in size. Compared to a
defined bass reflex enclosure, which
normally has a slight increase in the
sound pressure level, Utopia Be
subwoofers have improved power
handling characteristics. Therefore
this slight reduction of level can
be compensated with increased
amplification
(fig 1, 2)
.a
Bass-reflex enclosure
Bass-reflex enclosure suits to 21
WX subwoofer under conditions. It
brings a boost of energy around
50Hz to have dynamic bass. Bass-
reflex enclosure distinguishes by an
important efficiency in bass and
sub bass. Contrary to sealed box,
bass-reflex needs a bigger volume.
Please follow strckly each instruction
(volume, vent size …)
(fig. 3)
.
Inverse mounting
Because 21WX uses such large
impressive multi-ferrite driveunits.
You can invert the subwoofer. When
choosing inverted mounting, the
phase must be inverted, so that the
polarity is observed.
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English
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