L-Acoustics KS28 Owner's Manual
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L-Acoustics KS28 Owner's Manual

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Summary of Contents for L-Acoustics KS28

  • Page 1 KS28 owner's manual (EN)
  • Page 2 Document reference: KS28 owner's manual (EN) version 1.0 Distribution date: September 13, 2022 © 2022 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.

  • Page 3: Table Of Contents

    KS28-PLA............................15 KS28-COV and KS28-CHARIOTCOV....................16 Mechanical safety.............................17 Loudspeaker congurations..........................19 KS28 in standard conguration........................19 KS28 in cardioid conguration........................ 20 Inspection and preventive maintenance....................... 21 How to do preventive maintenance......................21 Rigging part inspection........................... 22 Mechanical system overview........................23 Inspection references..........................26 Rigging check............................31...
  • Page 4 Connection to LA amplied controllers........................ 45 Corrective maintenance............................. 47 Specications..............................54 KS28..............................54 KS28-BUMP............................56 KS28-PLA............................... 57 KS28-CHARIOT............................58 LA-SLING2T............................59 APPENDIX: Recommendation for speaker cables....................60...

  • Page 5: Safety

    Respect the Working Load Limit (WLL) of third party equipment. L-Acoustics is not responsible for any rigging equipment and accessories provided by third party manufacturers. Verify that the Working Load Limit (WLL) of the suspension points, chain hoists and all additional hardware rigging accessories is respected.
  • Page 6 This system is intended for use by trained personnel for professional applications. 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 documents without prior notice.

  • Page 7: Introduction

    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.

  • Page 8: Revision History

    8-point PA-COM to 4 × 2-point speakON DO3WFILL Breakout cable for one 2-way active enclosure and two passive enclosures (4 mm² gauge) 8-point PA-COM to 1 × 4-point speakON and 2 × 2-point speakON KS28 owner's manual (EN) version 1.0...
  • Page 9 KS28-COV Protective cover for 1 x KS28 KS28-CHARIOT Chariot for up to 4 x KS28 KS28-CHARIOTCOV Protective cover for 3 or 4 x KS28 on KS28-CHARIOT Software applications Soundvision 3D acoustical and mechanical modeling software LA Network Manager Software for remote control and monitoring of amplied controllers Refer to the Soundvision help.
  • Page 10 System components 3.5 m / 11.5 ft 2WAY SUB1 SUB2 DO3WFILL Rigging accessories KS28-BUMP LA-SLING2T Transportation KS28-PLA KS28-COV KS28-CHARIOT KS28- CHARIOTCOV KS28 owner's manual (EN) version 1.0...

  • Page 11: Electro-Acoustical Description

    Read manual and safety Made in France instructions before use European Community KS28 1 × 4-point speakON Internal pinout for L-Acoustics subwoofers SpeakON points Transducer connectors LF + LF - Not linked Not linked KS28 owner's manual (EN) version 1.0...

  • Page 12: Rigging System Description

    KS28 KS28 features three ergonomic handles on each side. KS28 features two ground runners for enclosure protection. Two tracks on the top of the enclosure t the ground runners in stacking deployment. KS28 features eight L-shaped side runners for side protection and upright stacking.

  • Page 13: Rigging Elements

    KS28-BUMP features two ball-locking pins to secure the KS28 rigging arms. KS28-BUMP provides two sets of pickup points to choose from depending on the position of the lifting points. In addition, two sets of holes are available to implement a secondary safety.

  • Page 14: Storage And Handling Elements

    Rigging system description Storage and handling elements KS28-CHARIOT KS28-CHARIOT is designed to transport a stack of up to four KS28 and features two rigging arms to secure the lower KS28. KS28 owner's manual (EN) version 1.0...

  • Page 15: Ks28-Pla

    Do not use the brakes during transportation. Multiple KS28-CHARIOT can be piled for easy storage. KS28-PLA KS28-PLA is a dolly board designed to be tted to the front of a KS28 with two spring-loaded pins. KS28 owner's manual (EN) version 1.0...

  • Page 16: Ks28-Cov And Ks28-Chariotcov

    KS28-CHARIOTCOV is a cover for a stack of three to four KS28 on KS28-CHARIOT. To t a stack of three KS28, KS28-CHARIOTCOV must be folded inwards and secured with the provided velcro straps. the logo must be on the...

  • Page 17: Mechanical Safety

    Mechanical safety Mechanical safety Flown congurations The KS28 rigging system complies with 2006/42/EC: Machinery Directive. It has been designed following the guidelines of BGV-C1. 2006/42/EC: Machinery Directive species a safety factor of 4 against the rupture. The own deployments described in this manual achieve a safety factor of 5 or more.
  • Page 18 Soundvision calculations are based on usual environmental conditions. A higher safety factor is recommended with factors such as extreme high or low temperatures, strong wind, prolonged exposition to salt water, etc. Always consult a rigging specialist to adopt safety practices adapted to such a situation. KS28 owner's manual (EN) version 1.0...

  • Page 19: Loudspeaker ConGurations

    Loudspeaker congurations KS28 in standard conguration Deployed in a standard conguration, 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 60 Hz and 100 Hz respectively in order to optimize the acoustic coupling with a main full-range system.

  • Page 20: Ks28 In Cardioid ConGuration

    KS28 in cardioid conguration Deployed in a cardioid conguration, a KS28 system produces a rear SPL rejection. The deployment consists of an array of four KS28 with one element turned towards the rear (reverse). Refer to the Cardioid Conguration technical bulletin for more information.

  • Page 21: Inspection And Preventive Maintenance

    (p.23) to identify critical parts of the system and apply the specic checks described in the Inspection references (p.26). Do the Rigging check (p.31). If any parts are damaged, contact your L-Acoustics representative for further instructions. Acoustics Perform the Enclosure check (p.33). Perform the Listening test (p.35) to detect any degradation in sound quality.

  • Page 22: Rigging Part Inspection

    • rigging elements integrated in the product such as rigging arms and rails • transportation accessories This inspection procedure covers only L-Acoustics products. To inspect other products that are part of the lifting chain, refer to the manufacturer's instructions. Prerequisite Perform the inspection in a well-lit environment.

  • Page 23: Mechanical System Overview

    If a screw is loose, remove and replace it. Always use the new screws provided in the repair kit. If no new screw is available, add blue threadlocker before reusing the screw. Do not apply more than the indicated torque. KS28 owner's manual (EN) version 1.0...
  • Page 24 Inspection and preventive maintenance KS28 array with KS28-BUMP Shackles (p.26) Ball-locking pins (p.27) Rigging check (p.31) Grill safety (p.30) Runners and corner stops (p.29) KS28 owner's manual (EN) version 1.0...
  • Page 25 Inspection and preventive maintenance KS28 array with KS28-CHARIOT Rigging check (p.31) Grill safety (p.30) Runners and corner stops (p.29) the rigging arm can rotate freely apply the brakes: the stack is blocked KS28 owner's manual (EN) version 1.0...

  • Page 26: Inspection References

    Inspection and preventive maintenance Inspection references Shackles Drive the shackle axis in its lodging. Make sure that the end is ush with the shackle. Related tasks Rigging part inspection (p.22) KS28 owner's manual (EN) version 1.0...
  • Page 27 If the pin is inserted in two plates, the ball must pass through both plates and lock the pin in place. If the check fails, immediately withdraw the product from use and contact L-Acoustics. KS28 owner's manual (EN) version 1.0...
  • Page 28 Inspection and preventive maintenance Related tasks Rigging part inspection (p.22) KS28 owner's manual (EN) version 1.0...
  • Page 29 Inspection and preventive maintenance Runners and corner stops • Runners are not worn out. • Screws are tightened. Reference pictures KS28 ground runner and corner stops KS28 corner stop KS28-OUTRIG runner Contact your L-Acoustics representative for repair instructions. Related tasks Rigging part inspection (p.22)
  • Page 30 1. Make sure that the O-rings are not damaged. 2. Make sure that the screw is tightened. 3. Pull on the O-rings: • Make sure they do not break. • Make sure they are not loose. KS28 owner's manual (EN) version 1.0...

  • Page 31: Rigging Check

    Inspection and preventive maintenance Rigging check Procedure 1. Secure one KS28 on top of another one. Push and slide to unlock the spring-loaded pin. Connect the rigging systems on both sides. SHLAK! a. The rigging arm is removed from its storage position with some resistance.
  • Page 32 2. Hold the top enclosure by the handles and shake the assembly. The two enclosures remain attached. 3. Unlock the rigging system on both sides. 4. Switch the enclosures and repeat the procedure. KS28 owner's manual (EN) version 1.0...

  • Page 33: Acoustical Check

    6. Press the OK key or the encoder wheel to launch the ENCLOSURE CHECK. The amplied controller generates short sinusoidal signals simultaneously for each connected output. The amplied controller displays the results for each output. KS28 owner's manual (EN) version 1.0...
  • Page 34 • a percentage of variation from the expected range (found in NOK and UNDEF results) • the number of operational transducers out of the total Low variations from the expected range are acceptable: displayed percentage can be different from 0 and all transducers considered operational. KS28 owner's manual (EN) version 1.0...
  • Page 35 4. Carefully clean the speaker with a dry cloth. 5. Perform the reassembly procedure. Replace the speaker gasket and the screws. Apply the recommended torque. 6. Repeat the listening test. If the problem persists, replace the speaker. KS28 owner's manual (EN) version 1.0...

  • Page 36: Rigging Procedures

    Assembly Procedure 1. Engage both brakes on KS28-CHARIOT. 2. Place KS28 on KS28-CHARIOT and connect the two elements on both sides. SHLAK! 3. Place another KS28 on the assembly. Align the runners with the tracks. KS28 owner's manual (EN) version 1.0...
  • Page 37 Visually check that no yellow labels are visible. Manually check that all linking points are secured. 6. Disengage the brakes and position the stack at its nal position. 7. Block the stack using both brakes. KS28 owner's manual (EN) version 1.0...

  • Page 38: Stacking Ks28 Upright

    In standard conguration, the logos on both enclosures must be on the same side. In cardioid conguration, the logos must be on opposite sides. 2. Place another KS28 on the rst one. Make sure the side runners t together. KS28 owner's manual (EN) version 1.0...

  • Page 39: Flying Ks28

    Verify that no unattached items remain on the product or assembly. Assembly Procedure 1. Secure two chains to the selected pick-up points on KS28-BUMP. 2. Lift the assembly. 3. Position a stack of KS28 under the pickup point. Stacking KS28 vertically (p.36).
  • Page 40 Rigging procedures 4. Lower the assembly and connect KS28-BUMP to the top enclosure on both sides. 5. If KS28 is stacked on KS28-CHARIOT, remove the rigging arms from the chariot before lifting. Final check Visually check that no yellow labels are visible.
  • Page 41 Rigging procedures Risk of collision Do not stand close to the array when lifting the enclosures. 6. Lift the assembly and remove the chariot. 7. Position another KS28 or KS28 stack under the pickup point. KS28 owner's manual (EN) version 1.0...
  • Page 42 Rigging procedures If KS28 is stacked on KS28-CHARIOT, make sure the KS28-CHARIOT brakes are not engaged. 8. Lower the assembly on the stack and connect the stack to the assembly on both sides. Align the runners and the tracks. SHLAK! 9.
  • Page 43 1. Position a KS28-CHARIOT under the array. Prepare KS28-CHARIOT Make sure the KS28-CHARIOT brakes are not engaged. Make sure the KS28-CHARIOT rigging arms are in the open position. Proceed slowly when lowering the array. 2. Lower the array until it rests on KS28-CHARIOT.
  • Page 44 Rigging procedures 3. Secure the bottom enclosure to KS28-CHARIOT. SHLAK! 4. Disconnect a stack from the array on both sides. Make sure both linking points are disconnected before lifting the array. 5. Lift the assembly and put the stack aside.

  • Page 45: Connection To La AmpliEd Controllers

    4− 2− For passive loudspeakers, the value corresponds to the number of enclosures in parallel on the output. For active loudspeakers, the value corresponds to the number of sections in parallel on the output. KS28 owner's manual (EN) version 1.0...
  • Page 46 Refer to the cabling schemes to connect the enclosures to different types of output connectors. Two-channel speakON output CH(1) SP-Y1 CC4FP CH(2) 1+/1- 2+/2- Four-channel CA-COM output SPK1 2WAY SPK2 SUB1 SPK3 SUB2 SPK4 KS28 owner's manual (EN) version 1.0...

  • Page 47: Corrective Maintenance

    D/R - Grill (p.49) • D/R - LF loudspeaker (p.53) For advanced maintenance, contact your L-Acoustics representative. Tools Before performing maintenance on this product, make sure all the tools listed are available. Reference are given for FACOM ® products in this table. Other manufacturers can be used.
  • Page 48 Corrective maintenance Disassembly and Reassembly procedures In order to operate, follow the order outlined here. Grill KR SECUGRL LF loudspeaker G03229 KS28 owner's manual (EN) version 1.0...
  • Page 49 Kit 100 safety O-rings for front grill ×100 ×1 100557 100226 grill safety O-ring grill safety tool Prerequisite The enclosure is placed on its rear. Disassembly Procedure 1. Loosen the captive grill screw. 5 mm KS28 owner's manual (EN) version 1.0...
  • Page 50 If the grill is secured with an O-ring, pull it down before removing the grill. Reassembly Procedure 1. Slide the O-ring under the captive screw insert. Use a at screwdriver to push the O-ring under the insert. 2. Apply blue threadlocker on the captive screw. KS28 owner's manual (EN) version 1.0...
  • Page 51 Corrective maintenance 3. Position the grill starting with the top. 4. With the 100226, stretch the O-ring and pull it above the captive screw. KS28 owner's manual (EN) version 1.0...
  • Page 52 Corrective maintenance 5. Secure the grill with the captive screw. Use the 5 mm hex bit and set the torque to 3 N.m. 3 N.m 5 mm KS28 owner's manual (EN) version 1.0...
  • Page 53 For safety reasons, always use the new screws and spare parts provided in the KR. If no new screws are available, use blue threadlocker. Gradually tighten the screws following a star pattern. Check that the cable tie is intact. 5 N.m 5 mm KS28 owner's manual (EN) version 1.0...

  • Page 54: SpeciCations

    3D fabric Rigging components high grade steel Finish dark grey brown Pantone 426 C IP55 Peak level at 1 m under half space conditions using pink noise with crest factor 4 (preset specied in brackets). KS28 owner's manual (EN) version 1.0...
  • Page 55 Specications KS28 dimensions 702 mm / 27.6 in 1340 mm / 52.8 in 1351 mm / 53.2 in KS28 owner's manual (EN) version 1.0...

  • Page 56: Ks28-Bump

    Specications KS28-BUMP specications Description Lifting beam for ying up to 16 x KS28 2 × Ø19 mm shackles WLL 3.25 t Weight (net) 15.5 kg / 34.2 lb Material high grade steel with anti-corrosion coating KS28-BUMP dimensions 1200 mm / 47.2 in 100 mm / 3.9 in...

  • Page 57: Ks28-Pla

    Specications KS28-PLA specications Description Removable front dolly on wheels for 1 x KS28 Weight (net) 14 kg / 30.8 lb KS28-PLA dimensions 1340 mm / 52.8 in KS28 owner's manual (EN) version 1.0...

  • Page 58: Ks28-Chariot

    Specications KS28-CHARIOT specications Description Chariot for up to 4 x KS28 Weight (net) 53.5 kg / 118 lb KS28-CHARIOT dimensions 1450 mm / 57.1 in KS28 owner's manual (EN) version 1.0...

  • Page 59: La-Sling2T

    Nominal length incl. hooks 1000 mm / 39.4 in Maximum sling angle β 60° 2.8 t for β : 0° - 45° Load rating 2 t for β : 46° - 60° LA-SLING2T illustration KS28 owner's manual (EN) version 1.0...

  • Page 60: Appendix: Recommendation For Speaker Cables

    8 Ω load 4 Ω load 2.7 Ω load Use the more detailed L-Acoustics calculation tool to evaluate cable length and gauge based on the type and number of enclosures connected. The calculation tool is available on our website: https://www.l-acoustics.com/installation-tools/...
  • Page 61 L-Acoustics 13 rue Levacher Cintrat - 91460 Marcoussis - France +33 1 69 63 69 63 - info@l-acoustics.com www.l-acoustics.com...

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