L-ACOUSTICS XT Manual V1.1 2/11/2003 36
STAGE
PATH
DIFFERENCE
MEASUREMENT
MICROPHONE
FLOOR
TIME DELAY
(SB218)
(FLOWN
SYSTEM)
d
sub (m)
d
FLOWN=
d+
SUB
PATH DIFFERENCE
d
s
u
b
(m
)
(SB218)
PATH DIFFRENCE (meters)
343 (meters/second)
T
=
Figure 17: Illustration of subwoofer time alignment
In most cases, 3W presets are used for flown XT and ground stacked subwoofer configurations in (3-
way mode or with separate AUX drive for the subwoofers) since the subwoofers can be used with
positive polarity and this helps to simplify installation and system tuning.
If more low frequency energy is desired from the flown XT system, 3WX presets can be used and
subwoofer polarity will depend on how subwoofers are processed, i.e., whether they are driven with
the same signal as the XT enclosure or driven via discrete AUX send. Following time alignment,
subwoofer polarity is a parameter to experiment with in order to obtain the best results.
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