Figure 17: Illustration Of Subwoofer Time Alignment - L-Acoustics 112XT Operator's Manual

(FLOWN
SYSTEM)
STAGE
(SB218) (SB218)
TIME DELAY
PATH DIFFRENCE (meters)
T
=
343 (meters/second)
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.
L-ACOUSTICS XT Manual V1.1
PATH
DIFFERENCE

Figure 17: Illustration of subwoofer time alignment

2/11/2003
d d +
PATH DIFFERENCE
FLOWN= SUB
d
sub (m)
d
sub (m)
MEASUREMENT
MICROPHONE
FLOOR
36