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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 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.

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-reex tuned enclosure. The optimized L-

Vents laminar vented port reduce turbulence and port noise at high levels while also increasing LF efciency.
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 amplied 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 efcient 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 signicantly 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

Содержание KS28

Страница 1: ...KS28 user manual EN...

Страница 2: ...anual 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 wr...

Страница 3: ...on guration 8 KS28 in cardioid con guration 9 Loudspeaker connection 10 Connectors 10 Connection to LA12X 11 Preset description 13 Recommendation for speaker cables 14 Maintenance 15 Disassembly and R...

Страница 4: ...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...

Страница 5: ...ing physical deployment and the suitable preset The KS28 is the rst L Acoustics enclosure to fully utilize the LA12X ampli ed controller power The LA12X ensures advanced crossover functions linearizat...

Страница 6: ...ome in three sizes DO 7 0 7 m 2 3 ft DO10 10 m 32 8 ft and DO25 25 m 82 ft DOSUB LA8 breakout cable for four passive enclosures 4 mm gauge 8 point PA COM to 4 2 point speakON DO3WFILL breakout cable f...

Страница 7: ...nts 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 E...

Страница 8: ...ystem The KS28 subwoofers can only be driven by the LA12X ampli ed controller vertical on end block stacked upright horizontal Preset KS28_60 KS28_100 Low frequency limit 10 dB 25 Hz Delay values When...

Страница 9: ...the acoustic coupling with a main full range system The KS28 subwoofers can only be driven by the LA12X ampli ed controller vertical on end block stacked upright Preset KS28_60_C KS28_100_C Low freque...

Страница 10: ...nstructions before use Made in France European Community SAFE USE 16 KS28 FOROTHERCONFIGURATIONS CHECKMECHANICAL SAFETYWITHSOUNDVISIONSOFTWARE USEONLYWITHL ACOUSTICSAMPLIFIEDCONTROLLERS KS28 Weight 79...

Страница 11: ...enclosures per controller KS28 1 4 Impedance load KS28 1 enclosure 4 Connecting subwoofers SP and SP Y1 on speakON output OUT1 OUT2 OUT3 OUT4 same as OUT1 OUT2 SP SP Y1 CC4FP CH 1 OUT1 CH 2 OUT2 DO an...

Страница 12: ...Loudspeaker connection Connecting a 2 way active enclosure with subwoofers DO and DO3WFILL on CA COM output CA COM DO DO3WFILL 2WAY OUT3 4 SUB1 OUT1 SUB2 OUT2 SP KS28 user manual EN version 3 0 12...

Страница 13: ...T 1 SB IN A 0 dB 0 ms ON OUT 2 SB IN A 0 dB 0 ms ON OUT 3 SB IN A 0 dB 0 ms ON OUT 4 SB IN A 0 dB 0 ms ON KS28_60_C KS28_100_C loudspeaker elements outputs channels routing gain delay polarity mute SR...

Страница 14: ...maximum length for loudspeaker cables depending on the cable gauge and on the impedance load connected to the ampli er recommended maximum length cable gauge 8 load 4 load 2 7 load mm 2 SWG AWG m ft...

Страница 15: ...Maintenance Maintenance Disassembly and Reassembly procedures In order to operate follow the order outlined here GRILL KR SECUGRL LF LOUDSPEAKER G03229 15 KS28 user manual EN version 3 0...

Страница 16: ...screwdriver 5 mm hex bit screwdriver extension 100226 provided in KR SECUGRL Disassembly 1 Loosen the captive grill screw 5 mm 2 Slide the grill to remove it If necessary pull down the safety O ring...

Страница 17: ...Maintenance Reassembly 1 Position the grill starting with the top 2 With the 100226 stretch the O ring and pull it above the captive screw 17 KS28 user manual EN version 3 0...

Страница 18: ...Maintenance 3 Secure the grill with the captive screw 3 N m 5 mm KS28 user manual EN version 3 0 18...

Страница 19: ...hex 18 speaker gasket Pre requisite Grill disassembled See Grill p 16 For safety reasons always use the new screws and spare parts provided in the KR If no new screws are available use blue threadlock...

Страница 20: ...Connection Use only 10 m 30 ft 4 mm AWG 11 speaker cables Do not connect enclosures in parallel Ampli ed controllers Load a preset corresponding to the connected loudspeaker s family Presets from the...

Страница 21: ...2 inspect the cables and connections 3 go to step 8 p 21 8 Under NC NOK and UNDEF results press and hold the corresponding OUT key The ampli ed controller displays the tested frequencies information...

Страница 22: ...r reassembly are too loose There is an air leak in the gasket There is dust on the cone The cone is damaged The voice coil and or the spider is damaged Procedure 1 Perform the loudspeaker disassembly...

Страница 23: ...Connectors 4 point speakON Rigging and handling ush tting 2 point rigging system 6 ergonomic handles 2 ground runners 8 side runners Weight net 79 kg 174 lb Cabinet rst grade Baltic beech and birch pl...

Страница 24: ...KS28 speci cations KS28 dimensions 1340 mm 52 8 in 1351 mm 53 2 in 719 mm 28 3 in 550 mm 21 7 in 565 mm 22 2 in 702 mm 27 6 in KS28 user manual EN version 3 0 24...

Страница 25: ...m www l acoustics com L Acoustics GmbH Steierm rker Str 3 5 70469 Stuttgart Germany 49 7 11 89660 323 L Acoustics Ltd PO Box Adler Shine Aston House Cornwall Avenue London N3 1LF United Kingdom 44 722...

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