L-Acoustics KS21 - Introduction; KS21 Compact Reference Subwoofer; How to Use this Manual

Introduction
Introduction
KS21 compact reference subwoofer
KS21 is a compact reference subwoofer designed to extend the bandwidth of A15 and A10 systems. KS21 features one
high excursion, direct radiating 21" transducer mounted in a bass-reex tuned enclosure.
KS21 operates from 29 Hz to 60 Hz when associated with A15, or 30 Hz to 100 Hz when associated with A10. KS21
features L-Vents that substantially reduce turbulence and port noise at high levels while also increasing LF efciency.
The KS21 frequency response is optimized to couple perfectly with both systems. KS21 features a two-point, integrated
rigging system that is compatible with A15. Combinations of KS21 and A15 can be own or stacked to form a full range
line source. KS21 also integrates a threaded insert to enable pole-mount congurations of A15 or A10.
KS21 can be deployed in standard or cardioid congurations with dedicated presets, for own and stacked deployment.
How to use this manual
The KS21 owner's manual is intended for all actors involved in the system design, implementation, preventive and
corrective maintenance of the KS21 system. It must be used as follows:
1. Read the technical description for an overview of all system elements, their features, and their compatibilities.
• Electro-acoustical description (p.11)
• Rigging system description (p.12)
2. Prepare the system conguration. Consider the mechanical limits and the available acoustical congurations.
• Mechanical safety (p.24)
• Loudspeaker congurations (p.26)
3. Before rigging the system, perform mandatory inspections and functional checks.
• Inspection and preventive maintenance (p.28)
4. To deploy the system, follow the step-by-step rigging instructions and refer to the cabling schemes.
• Rigging procedures (p.47)
• Connection to LA amplied controllers (p.57)
The Corrective maintenance (p.58) section contains the operations authorized for the end user.
Performing another operation exposes to hazardous situations.
For advanced maintenance, contact your L-Acoustics representative.
As part of a continuous evolution of techniques and standards, L-Acoustics reserves the right to
change the specications of its products and the content of its document without prior notice. Please
check www.l-acoustics.com on a regular basis to download the latest document and software updates.
Contact information
For information on advanced corrective maintenance:
• contact your Certied Provider or your L-Acoustics representative
• for Certied Providers, contact the L-Acoustics customer service: customer.service@l-acoustics.com
Symbols
The following symbols are used in this document:
This symbol indicates a potential risk of harm to an individual or damage to the product.
It can also notify the user about instructions that must be strictly followed to ensure safe installation or operation of
the product.
This symbol noties the user about instructions that must be strictly followed to ensure proper installation or
operation of the product.
This symbol noties the user about complementary information or optional instructions.
KS21 owner's manual (EN) version 2.1 7