L-Acoustics 8XT User manual

8XT Coaxial Enclosure
8XT Enceinte Coaxiale
VERSION 1.2
www.l-acoustics.com
EN
F
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USER MANUAL
MANUEL D’UTILISATION

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1SAFETY WARNINGS
All information hereafter detailed applies for the L-ACOUSTICS®8XT Coaxial Enclosure, designated in this section
as ‘‘the product’’.
1.1 Symbol description
Throughout this manual the potential risks are indicated by the following symbols:
The WARNING symbol indicates a potential risk of physical harm to the user
or people within close proximity to the product.
In addition, the product may also be damaged.
The CAUTION symbol notifies the user about information to prevent possible product damage.
The IMPORTANT symbol is a notification of an important recommendation of use.
1.2 Important safety instructions
1. Read this manual
2. Heed all safety warnings
3. Follow all instructions
4. The user should never incorporate equipment or accessories not approved by L-ACOUSTICS®
5. Sound Levels
Sound systems are capable of producing high Sound Pressure Levels which can be dangerous
and potentially cause hearing damage especially when exposed to them over a long period of time.
Do not stay within close proximity of the loudspeakers when operating.
6. Environments
Use the product only in E1, E2, E3, or E4 environments according to EN55103-2 standard.
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user manual
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7. Heat
Do not operate the product near any heat source, such as radiators or other devices.
8. Water and moisture
Even if the product is weather-resistant, it can not be exposed to moisture (rain, sea spray, shower,
steam) for a long period of time, nor put in direct contact or partially immersed in water.
This would cause irreversible damage to exposed components.
9. System Parts and Rigging inspection
All system components must be inspected before use, in order to detect any possible defects.
Please refer to the “Care and Maintenance” section of this manual as well as any other manuals
pertaining to the system for a detailed description of the inspection procedure.
Any part showing any sign of defect must immediately be put aside and withdrawn
for use to be inspected by qualified service personnel.
10. Mounting instructions
Do not place the product on an unstable cart, stand, tripod, bracket, or table.
The product may fall and be seriously damaged, and may cause serious human injury.
Any mounting of the product should follow the manufacturer’s instructions given in this manual,
and should use a mounting accessory recommended by the manufacturer.
11. Conditions which require immediate service
Servicing is required when the product has been damaged in any way such as:
•The product has been exposed to rain or moisture,
•The product was dropped or the enclosure is damaged,
•The product does not operate normally.
12. Manual
Keep this manual in a safe place during the product lifetime.
This manual forms an integral part of the product.
Reselling of the product is only possible if the user manual is available.
Any changes made to the product have to be documented in writing and passed on to the buyer in
the event of resale.
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1.3 EC declaration of conformity
L-ACOUSTICS®
13 rue Levacher Cintrat
Parc de la Fontaine de Jouvence
91462 Marcoussis Cedex
France
States that the following product:
Loudspeaker enclosure, 8XT
Is in conformity with the provisions of:
Machinery Directive 98/37/EC
Low Voltage Directive 73/23/EC
Applied rules and standards:
EN ISO 12100-1: 2004
EN60065
Established at Marcoussis, France
January 8th, 2007
Jacques Spillmann

8XT COAXIAL ENCLOSURE
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VERSION 1.2
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2CONTENTS
1SAFETY WARNINGS 1
1.1 Symbol description .................................................................................................................................................. 1
1.2 Important safety instructions................................................................................................................................... 1
1.3 EC declaration of conformity .................................................................................................................................. 3
2CONTENTS 4
3INTRODUCTION 5
3.1 Welcome to L-ACOUSTICS®................................................................................................................................. 5
3.2 Unpacking................................................................................................................................................................ 5
4XT COAXIAL RANGE 6
58XT COAXIAL ENCLOSURE 8
6INSTALLATION 9
6.1 Flying or stacking the 8XT....................................................................................................................................... 9
6.2 Connecting speakers ............................................................................................................................................... 9
7OPERATION 11
7.1 System configuration ............................................................................................................................................. 11
7.2 “FULL RANGE” mode .......................................................................................................................................... 11
7.2.1 Connecting 8XT to LA4......................................................................................................................... 11
7.2.2 [8XT_FR], [8XT_FI], and [8XT_MO] presets....................................................................................... 12
7.3 “HIGH-PASS” mode.............................................................................................................................................. 13
7.3.1 Connecting 8XT to LA4......................................................................................................................... 13
7.3.2 [8XT_FR_100], [8XT_FI_100], and [8XT_MO_100] presets............................................................... 13
7.4 “HYBRID’’ mode ................................................................................................................................................... 14
7.4.1 Connecting 8XT and SB118 to LA4....................................................................................................... 14
7.4.2 [8XT_SB118] preset .............................................................................................................................. 15
8CARE AND MAINTENANCE 16
8.1 Maintenance information....................................................................................................................................... 16
8.2 Testing procedure ................................................................................................................................................. 16
8.2.1 Check of transducer and enclosure acoustic behavior .......................................................................... 16
8.2.2 Check of mechanical assembly and rigging parts ................................................................................... 16
8.2.3 Check of external aspect ....................................................................................................................... 16
8.3 Transducer service ................................................................................................................................................ 17
8.3.1 LF loudspeaker....................................................................................................................................... 17
8.3.2 HF driver or diaphragm ......................................................................................................................... 17
8.4 Spare parts and recommended tools..................................................................................................................... 18
9SPECIFICATIONS 19

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3INTRODUCTION
3.1 Welcome to L-ACOUSTICS®
Thank you for purchasing the L-ACOUSTICS®8XT Coaxial Enclosure.
This manual contains essential information on installing and operating the product correctly and safely. Read this manual
carefully in order to make familiar with these procedures.
As part of a continuous evolution of techniques and standards, L-ACOUSTICS®reserves the right to
change the specifications of the product and the content of this manual without prior notice. Please check
the L-ACOUSTICS®web site @ www.l-acoustics.com on a regular basis for latest update.
If the product requires repair or if information about the warranty is needed, please contact an approved
L-ACOUSTICS®distributor. In order to obtain the address of the nearest distributor go to the L-ACOUSTICS®web
site.
3.2 Unpacking
Carefully open the shipping carton and check the product for any noticeable damage. Each L-ACOUSTICS® product is
tested and inspected before leaving the factory and should arrive in perfect condition.
If found to be damaged, notify the shipping company or the distributor immediately. Only the consignee may initiate a
claim with the carrier for damage incurred during shipping. Be sure to save the carton and packing materials for the
carrier's inspection.

8XT COAXIAL ENCLOSURE
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4XT COAXIAL RANGE
The L-ACOUSTICS®8XT enclosure is the most compact model within the L-ACOUSTICS®XT Coaxial Range
and operates over the 65 Hz to 20 kHz frequency bandwidth. This response can be extended down to 32 Hz with the
addition of the L-ACOUSTICS®SB118 subwoofer.
The system approach developed by L-ACOUSTICS®for the XT range consists of the elements needed to fully take
advantage of the possible configurations and optimize the system. The main components of the system are:
8XT  Passive compact coaxial enclosure
12XT  Active/passive multipurpose coaxial enclosure
115XT HiQ  Active coaxial stage monitor
ETR8-2  Mounting accessory for the 8XT enclosure
ETR12  Mounting accessory for the 12XT enclosure
ETR15  Mounting accessory for the 115XT HiQ enclosure
XTLIFTBAR  Rigging accessory for the 12XT and 115XT HiQ enclosures
SB118  Subwoofer enclosure
LA4  Medium power amplified controller
LA RAK  Amp rack containing three LA8 high power amplified controllers
LA NETWORK MANAGER  Software for remote controlling the amplified controllers
SOUNDVISION  Acoustical and mechanical modeling software
Figure 1: XT range components (part 1)
ETR8-2 ETR12 ETR15
12XT 115XT HIQ
8XT
XTLIFTBA
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SB118

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Figure 2: XT range components (part 2)
The XT range components are compatible with standard L-ACOUSTICS®accessories. These accessories include the
loudspeaker cables L-ACOUSTICS® SP.7, SP10, and SP25 with respective lengths of 0.7 m/2.3 ft., 10 m/32.8 ft., and
25 m/ 82 ft. These cables allow connection of the 8XT and 12XT enclosures to the LA4 amplified controller. Each cable
is a 4-conductor cable with 4 mm2conductor cross-section (13 SWG, 11 AWG) and features Speakon®NL4
connectors.
The L-ACOUSTICS®DOFILL-LA8 cable allows connection of the 115XT HiQ enclosure to the LA8 amplified
controller. This cable features CA-COM®8-pin type and Speakon®NL4 connectors and must be extended using the
L-ACOUSTICS®DO.7, DO10, or DO25 cables with respective lengths of 0.7 m/2.3 ft., 10 m/32.8 ft., and 25 m/ 82
ft. Each DO cable is an 8-conductor cable with 4 mm2conductor cross-section (13 SWG, 11 AWG) and features
CA-COM®8-pin type connectors.
Connecting the old DOFILL cable on the LA8 amplified controller for an active 2-way application
may result in damaging the loudspeaker components.
Always connect the new DOFILL-LA8 cable on the LA8 amplified controller for active 2-way
applications.
The 8XT and 12XT are driven and powered by the L-ACOUSTICS®LA4 amplified controller. The 115XT HiQ is
driven and powered by the L-ACOUSTICS®LA8 amplified controller. These controllers ensure intelligent protection,
filtering, and equalization of the enclosures. Four channels of amplification are provided along with the OEM factory
preset libraries, ensuring the optimization and performance of the systems within the limits of the recommended
configurations.
Each system design configuration should first be modeled and studied using the L-ACOUSTICS®SOUNDVISION
software. The software predictions are based on the preset parameters stored in the amplified controllers.
Several amplified controllers can be interconnected and monitored through the proprietary L-ACOUSTICS®L-NET
network using the L-ACOUSTICS®LA NETWORK MANAGER software.
Detailed description on the use of the LA4 and LA8 amplified controllers, SOUNDVISION and LA NETWORK
MANAGER software is beyond the scope of this manual. Please refer to the appropriate documentation, also available
on the L-ACOUSTICS®web site @ www.l-acoustics.com.
L
A
-RAK with 3 LA8
SOUNDVISION
LA4
LA NETWORK MANAGE
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8XT COAXIAL ENCLOSURE
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58XT COAXIAL ENCLOSURE
L-ACOUSTICS®8XT enclosure contains a 1.5’’ diaphragm compression driver coaxially loaded (for HF directivity
control) by an 8’’ low frequency transducer mounted in a bass-reflex tuned enclosure. The internal passive crossover
network uses proprietary third order filters. The linearization and protection of the transducers is defined by the drive
parameters contained in the LA4 amplified controller. The nominal impedance of the 8XT enclosure is 8 ohms.
The coaxial transducer arrangement produces a 100° axi-symmetric directivity output along with a smooth tonal
response free of secondary lobes over the entire frequency range.
The wedge-shaped cabinet design makes the 8XT perfectly suited to all stacked sound reinforcement applications. The
cabinet can also be flown as well as pole, wall, or ceiling-mounted.
The 8XT cabinet is made of high grade Baltic birch plywood with remarkable mechanical and acoustical properties for
improved long term durability.
Figure 3: The 8XT enclosure
predrilled template
Grill
Pole mount socket
Wedge-shaped cabinetry
Safety eyebolt insert