L-Acoustics KS28 Bedienungsanleitung
KS28
user manual (EN)
Document reference: KS28 user manual (EN) version 3.0
Distribution date: March 7, 2017
© 2017 L-Acoustics. All rights reserved.
No part of this publication may be reproduced or transmitted in any
form or by any means without the express written consent of the
publisher.
Contents
Safety................................................................................................................................................................ 4
Instructions................................................................................................................................................4
Symbols................................................................................................................................................... 4
Welcome........................................................................................................................................................... 5
System components.............................................................................................................................................6
Loudspeaker cables...................................................................................................................................7
Loudspeaker congurations..................................................................................................................................8
KS28 in standard conguration..................................................................................................................8
KS28 in cardioid conguration.................................................................................................................. 9
Loudspeaker connection.................................................................................................................................... 10
Connectors............................................................................................................................................. 10
Connection to LA12X.............................................................................................................................. 11
Preset description..............................................................................................................................................13
Recommendation for speaker cables...................................................................................................................14
Maintenance.................................................................................................................................................... 15
Disassembly and Reassembly procedures.................................................................................................. 15
D/R - Grill....................................................................................................................................16
D/R - LF loudspeaker.....................................................................................................................19
Acoustical check..................................................................................................................................... 20
Enclosure check........................................................................................................................... 20
Listening test................................................................................................................................. 22
KS28 specications...........................................................................................................................................23
3
Safety
Safety
Instructions
Inspect the product before operation.
If any sign of defect or damage is detected, immediately withdraw the product from use for maintenance.
Never incorporate equipment or accessories not approved by L-Acoustics.
Read all the related PRODUCT INFORMATION documents shipped with the products before
exploiting the system.
Do not store the product on an unstable cart, stand, tripod, bracket, or table.
Beware of sound levels.
Do not stay within close proximity of loudspeakers in operation.
Loudspeaker systems are capable of producing very high sound pressure levels (SPL) which can instantaneously
lead to permanent hearing damage to performers, production crew and audience members. Hearing damage
can also occur at moderate level with prolonged exposure to sound.
Check the applicable laws and regulations relating to maximum sound levels and exposure times.
This system is intended for professional use.
Read the RIGGING MANUAL before installing the system.
Use the rigging accessories described in the rigging manual and follow the associated procedures.
Read the maintenance section of this document before servicing the product.
Do not expose the product to extreme conditions.
Do not expose the product to rain or sea spray.
Do not expose the product to moisture (mist, steam, humidity, condensation…) or excessive heat (direct sun,
radiator…) for a long period of time.
Contact L-Acoustics for advanced maintenance.
Any unauthorized maintenance operation will void the product warranty.
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 noties the user about instructions that must be strictly followed to ensure proper installation or
operation of the product.
This symbol noties the user about complementary information or optional instructions.
KS28 user manual (EN) version 3.0 4
Welcome
Welcome
Thank you for purchasing the L-Acoustics KS28.
This document contains essential information on using the system properly.
As part of a continuous evolution of techniques and standards, L-Acoustics reserves the right to
change the specications 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.
KS28 reference subwoofer
The KS28 is a reference subwoofer designed to extend the frequency response of large format systems. The KS28
features two high excursion, 18’’ direct radiating transducers mounted in a bass-reex tuned enclosure. The optimized L-
Vents laminar vented port reduce turbulence and port noise at high levels while also increasing LF efciency.
The KS28 operates from 25 Hz. The excursion capability of the transducer, combined with L-Vents contributes to deliver a
high SPL, with low distortion. The KS28 can offer standard or cardioid directivity, by combining physical deployment and
the suitable preset.
The KS28 is the rst L-Acoustics enclosure to fully utilize the LA12X amplied controller power. The LA12X ensures
advanced crossover functions, linearization and L-Drive protection of the transducers. Its onboard library offers standard
and cardioid presets, each available with two low-pass lters to accommodate various coupling conditions and LF
contour requirements.
The KS28 cabinet is assembled with birch and beech plywood panels. The use of panels optimized for thickness and
combined with stiffeners gives the KS28 maximized internal volume, mechanical integrity and a low weight of 79 kg. It
feature six ergonomic handles for a solid grip and efcient handling. Bottom and side runners ensure safe stacking. A
two-point suspension system is ush-mounted into the cabinet.
The KS28 is the ideal companion to large format systems in stacked or own deployments. KS28 can signicantly boost
the LF extension and contour of line sources.
The KS28 can be stacked horizontally or vertically in standard or cardioid arrangements. With KS28-BUMP, KS28 can
be own in vertical arrays of standard or cardioid arrangements, up to 16 units.
5 KS28 user manual (EN) version 3.0
System components
System components
Loudspeaker enclosures
KS28 Flyable subwoofer 2 x 18''
Powering and driving system
LA12X Amplied controller with DSP, preset library and networking capabilities
LA-RAK II Touring rack containing three LA12X, LA-POWER II for power distribution and LA-PANEL II for
audio and network distribution
Refer to the LA12X user manual for operating instructions.
Loudspeaker cables
SP cables 4-point speakON loudspeaker cables (4mm² gauge)
SP cables come in four sizes: SP.7 (0.7m/2.3ft), SP5 (5m/16.4ft), SP10 (10 m/32.8ft) and
SP25 (25m/82ft)
SP-Y1 breakout cable for two passive enclosures (2.5mm² gauge) provided with a CC4FP adapter
4-point speakON to 2 × 2-point speakON
DO 8-point PA-COM loudspeaker cables (4mm² gauge)
DO cables come in three sizes: DO.7 (0.7m/2.3ft), DO10 (10m/32.8ft) and DO25
(25m/82ft)
DOSUB-LA8 breakout cable for four passive enclosures (4mm² gauge)
8-point PA-COM to 4 × 2-point speakON
DO3WFILL breakout cable for one 2-way active enclosure and two passive enclosures (4mm² gauge)
8-point PA-COM to 1 x 4-point speakON and 2 x 2-point speakON
Information about the connection of the enclosures to the LA ampliers is given in this
document.
Refer to the LA12X user manual for detailed instructions about the whole cabling scheme, including modulation
cables and network.
Rigging elements
Rigging elements or procedures are not presented in this document.
Refer to the KS28 rigging manual.
Software applications
Soundvision 3D acoustical and mechanical modeling software
LA Network Manager Software for remote control and monitoring of amplied controllers
Refer to the Soundvision help.
Refer to the LA Network Manager video tutorial.
KS28 user manual (EN) version 3.0 6
System components
Loudspeaker cables
0.7 m / 5 m / 10 m / 25 m
CH(1)
CH(2)
1 m
SP.7 / SP5 / SP10 / SP25 SP-Y1
0.7 m / 10 m / 25 m
SPK1
SPK2
SPK3
SPK4
5 m
DO.7 / DO10 / DO25 DOSUB-LA8
2W CH(A)
2W CH(B)
3.5 m
DOFILL-LA8
7 KS28 user manual (EN) version 3.0
Loudspeaker congurations
Loudspeaker congurations
KS28 in standard conguration
Deployed in a standard conguration, a KS28 system operates with an omnidirectional directivity pattern over the
nominal bandwidth of the KS28 enclosure.
The [KS28_60] and [KS28_100] factory presets provide the subwoofer system with an upper frequency limit at 60Hz
and 100Hz respectively in order to optimize the acoustic coupling with a main full-range system.
The KS28 subwoofers can only be driven by the LA12X amplied controller.
vertical
on-end
block
stacked
upright
horizontal
Preset [KS28_60] [KS28_100]
Low frequency limit (-10 dB) 25 Hz
Delay values
When combining a line source with subwoofers, delays may have to be added to the presets.
Refer to the Preset Guide to obtain the pre-alignment delay values.
Grouping subwoofers
Place the subwoofer enclosures side by side. If not possible, the maximum distance between two adjacent
acoustic centers must be 2.8m or 1.7m if the upper frequency limit of the subwoofer system is at 60Hz or
100Hz, respectively.
KS28 user manual (EN) version 3.0 8
Loudspeaker congurations
KS28 in cardioid conguration
Deployed in a cardioid conguration, a KS28 system produces a rear SPL rejection. The deployment consists of an array
of four KS28 with one reversed element, i.e. turned towards the rear. Refer to the Cardioid Congurations technical
bulletin for more information.
The [KS28_60_C] and [KS28_100_C] factory presets provide the subwoofer system with an upper frequency limit at
60Hz and 100Hz respectively in order to optimize the acoustic coupling with a main full-range system.
The KS28 subwoofers can only be driven by the LA12X amplied controller.
vertical
on-end
block
stacked
upright
Preset [KS28_60_C] [KS28_100_C]
Low frequency limit (-10 dB) 25 Hz
Delay values
When combining a line source with subwoofers, delays may have to be added to the presets.
Refer to the Preset Guide to obtain the pre-alignment delay values.
Grouping subwoofers
Place the subwoofer enclosures side by side. If not possible, the maximum distance between two adjacent
acoustic centers must be 2.8m or 1.7m if the upper frequency limit of the subwoofer system is at 60Hz or
100Hz, respectively.
9 KS28 user manual (EN) version 3.0
Loudspeaker connection
Loudspeaker connection
Connectors
KS28 is equipped with one 4-point speakON connector.
KS28
IN
1k = IN k
1 - = IN -
Znom. = 4 Ω
Readmanual and safety
instructionsbefore use
Madein France
EuropeanCommunity
SAFE USE:
16 KS28
FOROTHERCONFIGURATIONS,CHECKMECHANICAL
SAFETYWITHSOUNDVISIONSOFTWARE
USEONLYWITHL-ACOUSTICSAMPLIFIEDCONTROLLERS .
KS28
Weight:79 kg / 174 lb
Internal pinout for L-Acoustics subwoofers
speakON points 1 + 1 - 2 + 2 -
Transducer connectors LF + LF - Not linked Not linked
KS28 user manual (EN) version 3.0 10
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