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7.3
"HIGH-PASS" mode
7.3.1
Description
In ''HIGH-PASS'' mode the 12XTi enclosures are 100 Hz high-pass filtered to allow using them along with the
dedicated complimentary SB18i subwoofers. The bandwidth of the system is extended down to 32 Hz. The
recommended ratio is one 12XTi for one SB18i.
7.3.2
Connecting the 12XTi to the LA4 / LA4X
Each 12XTi enclosure must be connected to an LA4 / LA4X output channel ranging from channel 1 through 4.
Therefore a single LA4 / LA4X amplified controller can drive up to four 12XTi enclosures (see Figure 5).
Note: The system resources are optimized for four 12XTi per LA4 / LA4X.
IN A
IN B
OUT 1 (IN A)
Figure 5: Four 12XTi enclosures connected to an LA4 / LA4X controller
7.3.3
[12XTP_FR_100], [12XTP_FI_100], and [12XTP_MO_100] presets
!
•
ALWAYS use the [12XTP_
•
NEVER mistake the [12XTP_
CAUTION
The [12XTP_FR_100] ''FRONT'' preset features a HF shelving EQ and a 100 Hz high-pass filter for FOH applications
with subwoofers.
The [12XTP_FI_100] ''FILL'' preset results in a ''flat'' contour down to 100 Hz in free field conditions for use in speech
reinforcement, classical music, or close proximity fill applications.
The [12XTP_MO_100] ''MONITOR'' preset results in a ''flat'' contour down to 100 Hz in half-space loading conditions
for floor monitoring, wall, or ceiling-mounted applications.
Activate the LOAD PRESET menu from the LA4 / LA4X amplified controller front panel and then select the desired
preset. Refer to the ''LA4 / LA4X'' user manual for additional instructions. The presets are also selectable using the
LA NETWORK MANAGER software (refer to the ''LA NETWORK MANAGER'' user manual). The accessible
parameters in ''HIGH-PASS'' mode are shown in the following chart:
Loudspeaker
Amplifier outputs
Elements
12XTi
12XTi
12XTi
12XTi
Note: The complimentary SB18i subwoofers must be connected to additional LA4 / LA4X or LA8 amplified controllers.
Please refer to the ''SB18i'' user manual.
12XTI_UM_ML_1-1
OUT 3 (IN B)
OUT 2 (IN A)
] PASSIVE presets with the 12XTi enclosure.
] PASSIVE presets for the [12XTA_
Table 3: Accessible parameters in ''HIGH-PASS'' mode
Channels
OUT 1
PA
OUT 2
PA
OUT 3
PA
OUT 4
PA
w w w . l - a c o u s t i c s . c o m
!
OUT 4 (IN B)
IMPORTANT
Default parameters
Routing
Gain
Delay
IN A
0 dB
0 ms
IN A
0 dB
0 ms
IN B
0 dB
0 ms
IN B
0 dB
0 ms
This picture is a
cabling scheme and
does not represent
a valid configuration.
] ACTIVE presets.
Polarity
Mute
+
ON
+
ON
+
ON
+
ON
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