High-Pass" Mode; Description; Connecting The 8Xt To The La4 / La4X; 8Xt_Fr_100], [8Xt_Fi_100], And [8Xt_Mo_100] Presets - L-Acoustics 8XT Manuel D'utilisation

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user manual user manual
user manual user manual
VERSION 1.3
7.3

"HIGH-PASS" mode

7.3.1

Description

In ''HIGH-PASS'' mode the 8XT enclosures are 100 Hz high-pass filtered to allow using them along with the dedicated
complimentary SB18 subwoofers. The bandwidth of the system is extended down to 32 Hz.
The recommended ratio is two 8XT for one SB18.
7.3.2

Connecting the 8XT to the LA4 / LA4X

Each 8XT enclosure must be connected to an LA4 / LA4X output channel ranging from channel 1 through 4. An
additional 8XT enclosure can be connected in parallel with each of the first ones. Therefore a single LA4 / LA4X
amplified controller can drive up to eight 8XT enclosures (see Figure 6).
Note: The system resources are optimized for four or eight 8XT per LA4 / LA4X.
Note: This drawing is only a cabling scheme and does not represent a valid configuration.
Figure 6: Eight 8XT enclosures connected to an LA4 / LA4X controller
7.3.3

[8XT_FR_100], [8XT_FI_100], and [8XT_MO_100] presets

The [8XT_FR_100] ''FRONT'' preset features a HF shelving EQ and a 100 Hz high-pass filter for FOH applications with
subwoofers.
The [8XT_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 [8XT_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 preset is also accessible using the LA
NETWORK MANAGER software (refer to the ''LA NETWORK MANAGER'' user manual). Accessible parameters
in ''HIGH-PASS'' mode are shown in the following chart:
Loudspeaker
Amplifier outputs
Elements
8XT
8XT
8XT
8XT
Note: The complimentary SB18 subwoofers must be connected to additional LA4, LA4X or LA8 amplified controllers.
Please refer to the ''SB18'' user manual.
8XT_UM_ML_1.4
IN A
IN B
OUT 1 (IN A)
OUT 2 (IN A)
Table 3: Accessible parameters in ''HIGH-PASS'' mode
Channels
OUT 1 PA
OUT 2 PA
OUT 3 PA
OUT 4 PA
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OUT 4 (IN B)
OUT 3 (IN B)
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
Polarity Mute
+ ON
+ ON
+ ON
+ ON
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