L-Acoustics A10 Owner'S Manual Download Page 49

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Loudspeaker congurations

A10 Wide/Focus line source element

A single A10 Wide/Focus can be used as a line source element. In this conguration, the system operates over the

nominal bandwidth of the enclosure.
The [A10_FI] preset delivers a reference frequency response in short throw applications.
The A10 Wide/Focus enclosure are driven by the LA4X / LA8 / LA12X amplied controllers.

Preset

[A10_FI]

Frequency range (-10 dB)

66 Hz - 20 kHz (A10 Focus)
67 Hz - 20 kHz (A10 Wide)

A10 owner's manual (EN) version 1.1

Summary of Contents for A10

Page 1: ...A10 owner s manual EN ...

Page 2: ...manual EN version 1 1 Distribution date January 6 2020 2020 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: ...tors 18 Connection to LA ampli ed controllers 19 Rigging system description 20 A10 system rigging 20 Enclosures 22 A10 Wide Focus 22 KS21 23 Rigging elements for own A10 arrays 24 A10 BUMP 24 A10 RIGBAR 26 A10 LIFT 28 Rigging elements for own KS21 arrays 30 A15 BUMP 30 A15 RIGBAR 32 Rigging elements for stacked arrays 34 A TILT 34 KS21 OUTRIG 36 K2 JACK 37 Rigging elements for a single enclosure 3...

Page 4: ...stical check 66 Rigging procedures 70 Flying 70 Flying a vertical array 70 Adding a pullback with A10 BUMP A10 RIGBAR 77 Flying a radial array with A10 LIFT 79 Flying a single enclosure with X BAR 85 Stacking 88 Stacking A10 Wide Focus on KS21 with A TILT 88 Stacking KS21 on KS21 CHARIOT 92 Attaching K2 JACK stabilizers to KS21 CHARIOT 94 Pole mounting 97 Corrective maintenance 99 A10 Focus 99 A10...

Page 5: ... are familiar with the rigging techniques and safety recommendations outlined in this manual Ensure personnel health and safety During installation and set up personnel must wear protective headgear and footwear at all times Under no circumstances is personnel allowed to climb on a loudspeaker assembly Respect the Working Load Limit WLL of third party equipment L Acoustics is not responsible for a...

Page 6: ...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 Check www l acoustics com on a regular basis to download the latest document and software updates Do not expose the product to extreme conditions Do not expose the product to moisture rain mist sea spray steam humidity c...

Page 7: ...rical and a range of accessories for vertical or horizontal deployment A10 deployment requires a single preset that is optimized to provide plug and play performance for both A10 models regardless of Pan ex con guration Performance can be further enhanced with Soundvision s sophisticated optimization tools On its own A10 provides extended low frequency capability adapted for vocal reinforcement an...

Page 8: ...ion 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 Cont...

Page 9: ... 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 Information about the connection of the enclosures to the LA ampli ed controllers is given in this document Refer to the LA4X LA8 LA12X user manual for detailed instructions about the whole cabling scheme including modulation cables and networ...

Page 10: ...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 Refer to the LA Network Manager help 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 10 A10 owner s ...

Page 11: ...ents Rigging elements A10 BUMP A10 LIFT A10 RIGBAR A15 BUMP A15 RIGBAR A TILT KS21 OUTRIG A MOUNT KS21 CHARIOT K2 JACK X BAR CLAMP250 LA SLING2T KS21 PLA KS21 COV KS21 CHARIOTCOV A10 owner s manual EN version 1 1 11 ...

Page 12: ...directivity to one of four settings 110 70 symmetric or 90 asymmetric 35 55 or 55 35 The same A10 preset drives all directivity settings of both enclosures Within a line source combine A10 Focus and A10 Wide with custom directivity settings to improve SPL mapping and throw capability 110 setting 55 55 12 A10 owner s manual EN version 1 1 ...

Page 13: ...Electro acoustical description 70 setting Set the ns in the 35 position to provide the system with a 2 dB on axis gain 2 kHz 35 35 90 settings 55 35 35 55 55 35 A10 owner s manual EN version 1 1 13 ...

Page 14: ...10 and a waveguide directivity pattern of 70 110 symmetric or 90 asymmetric depending on the ns settings 100 1 000 10 000 Frequency Hz 90 80 70 60 50 40 30 20 10 0 10 20 30 40 50 60 70 80 90 Angle Dispersion angle diagram of one upright A10 Focus using lines of equal sound pressure at 3 dB 6 dB 12 dB 14 A10 owner s manual EN version 1 1 ...

Page 15: ...80 Angle Dispersion angle diagram of one A10 Focus with 70 ns setting using lines of equal sound pressure at 3 dB 6 dB 12 dB A10 Wide A10 Wide generates an enclosure directivity pattern of 30 and a waveguide directivity pattern of 70 110 symmetric or 90 asymmetric depending on the ns settings 100 1 000 10 000 Frequency Hz 9 8 7 6 5 4 3 2 1 0 10 20 30 40 50 60 70 80 90 Angle 10 20 30 40 50 60 70 80...

Page 16: ...l sound pressure at 3 dB 6 dB 12 dB 100 1 000 10 000 Frequency Hz 180 160 140 120 100 80 60 40 20 0 20 40 60 80 100 120 140 160 180 Angle Dispersion angle diagram of one A10 Wide with 70 ns setting using lines of equal sound pressure at 3 dB 6 dB 12 dB Symmetrical con gurations The A10 rigging system is designed to enable a completely symmetrical setup for stereo applications 16 A10 owner s manual...

Page 17: ... PA IN A 0 dB 0 ms ON OUT 2 PA IN A 0 dB 0 ms ON OUT 3 PA IN B 0 dB 0 ms ON OUT 4 PA IN B 0 dB 0 ms ON KS21_100 outputs channels routing gain delay polarity mute OUT 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 KS21_100_C KS21_100_Cx loudspeaker elements outputs channels routing gain delay polarity mute SR OUT 1 SR ON SB OUT 2 SB ON SB OUT...

Page 18: ...speakON A10 Wide 2 4 point speakON Internal pinout for L Acoustics 2 way passive enclosures speakON points 1 1 2 2 Transducer connectors Not linked Not linked KS21 2 4 point speakON Internal pinout for L Acoustics subwoofers speakON points 1 1 2 2 Transducer connectors LF LF Not linked Not linked 18 A10 owner s manual EN version 1 1 ...

Page 19: ...e Focus KS21 Refer to the cabling schemes to connect the enclosures to different types of output connectors One channel speakON output SP SP 1 1 Two channel speakON output SP SP SP Y1 CC4FP CH 1 CH 2 1 1 2 2 Four channel CA COM output DO SP DOSUB LA8 SPK1 SPK2 SPK3 SPK4 For passive loudspeakers the value corresponds to the number of enclosures in parallel on the output For active loudspeakers the ...

Page 20: ... feature the same rigging system consisting of two elements A rotating rigging arm A spring loaded pin Push and slide to unlock the spring loaded pin SHLAK The rigging elements are tted with yellow safety labels that are visible when they are not safely locked 20 A10 owner s manual EN version 1 1 ...

Page 21: ...plays two ground runners on the bottom and two matching tracks on the top Eight corner stops protect the side panels during handling The logo on the enclosure front can be rotated to adapt to every con guration A10 owner s manual EN version 1 1 21 ...

Page 22: ... LIFT p 28 A DIN580 compatible M8 threaded insert is available to implement a secondary safety Two sets of two lodgings and one insert provide further options for ying stacking or pole mounting a single enclosure or small arrays with X BAR p 40 A TILT p 34 or A MOUNT p 39 respectively 22 A10 owner s manual EN version 1 1 ...

Page 23: ...1 KS21 features a 35 mm pole socket which contains an M20 150 insert Use a 35 mm diameter pole The pole can be non threaded or with M20 thread Use an adapter for poles with other dimensions for example the 21329 adapter by K M available on www k m de en A10 owner s manual EN version 1 1 23 ...

Page 24: ...T and KS21 PLA Use with other equipment may result in instability causing injury Rigging elements for own A10 arrays A10 BUMP A10 BUMP is a reversible rigging frame for ying vertical arrays of A10 Wide Focus A10 BUMP is equipped with rotating rigging arms and ball locking pins to match the rigging systems of A10 Wide Focus on either side 24 A10 owner s manual EN version 1 1 ...

Page 25: ... F and one rear pickup point R are available for site angle adjustments They are compatible with Ø12 mm shackles WLL 1 t two provided and CLAMP250 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 8 9 10 11 12 13 14 F R FRONT A10 BUMP can be used as the main lifting accessory for ying vertical arrays of A10 Wide Focus with one or two lifting points A10 owner s manual EN version 1 1 25 ...

Page 26: ...mounting plate is available Refer to APPENDIX B Installing the LAP TEQ inclinometer on A10 BUMP p 141 A10 RIGBAR A10 RIGBAR is a reversible rigging bar It can be used as a pullback or for ying vertical arrays of up to four A10 Wide Focus A10 RIGBAR is equipped with rotating rigging arms and ball locking pins to match the rigging systems of A10 Wide Focus on either side 26 A10 owner s manual EN ver...

Page 27: ...e Secured at the bottom of the array A10 RIGBAR can be used as a pullback either with A10 BUMP or another A10 RIGBAR as the main lifting accessory A10 RIGBAR can be used as the main lifting accessory to provide a lightweight solution for ying four A10 Wide Focus with one or two lifting points A10 owner s manual EN version 1 1 27 ...

Page 28: ...s implement a secondary safety using available holes One pickup point safety points pickup point Two pickup points pickup points safety point A10 LIFT A10 LIFT is a rigging element designed to y a radial array of up to three A10 Wide Focus A10 LIFT features two studs that match the lodgings at the front and rear of the enclosure studs 28 A10 owner s manual EN version 1 1 ...

Page 29: ...able radial array of A10 Wide Focus can be created using multiple A10 LIFT A10 LIFT quantity and position Use one A10 LIFT for up to three enclosures in the array Do not leave more than two adjacent enclosures unsupported Refer to APPENDIX A Authorized con gurations with A10 LIFT p 139 Risk of tilting When using a single motor or a bridle make sure the array is symmetrical When using a third party...

Page 30: ...of 7 enclosures and more p 140 Hole 8 serves as a setup point in the radial array procedure see Flying a radial array with A10 LIFT p 79 It is identi ed by a mark on the label setup point 1 2 3 4 5 6 7 8 9 10 11 12 13 FRONT Rigging elements for own KS21 arrays A15 BUMP A15 BUMP is a reversible rigging frame for ying vertical arrays of KS21 A15 BUMP is equipped with rotating rigging arms and ball l...

Page 31: ...F and one rear pickup point R are available for site angle adjustments They are compatible with Ø12 mm shackles WLL 1 t two provided and CLAMP250 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 F R FRONT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 A15 BUMP can be used as the main lifting accessory for ying vertical arrays of KS21 with one or two lifting points A10 owner s manual EN version 1 1 31 ...

Page 32: ... for ying vertical arrays of up to four KS21 A15 RIGBAR is equipped with rotating rigging arms and ball locking pins to match the rigging systems of KS21 on either side The rigging arms are tted with yellow safety labels that are visible when the rigging arm is not in use 32 A10 owner s manual EN version 1 1 ...

Page 33: ...r two lifting points The pickup points are compatible with Ø12 mm shackles WLL 1 t two provided and CLAMP250 When using A15 RIGBAR as the main lifting accessory always implement a secondary safety using available holes One pickup point safety points pickup point Two pickup points pickup points safety point A10 owner s manual EN version 1 1 33 ...

Page 34: ...IOT and use K2 JACK to stabilize the array Do not use A TILT in a own array The locating pins on A TILT match the lodgings on the enclosure to enable deployments with the HF section on either side A TILT is secured to the enclosure and to the subwoofer with threaded knobs A TILT compatible subwoofers The A TILT subwoofer knob can only be used with KS21 M20 subwoofer knob studs enclosure knob angle...

Page 35: ...bel displays the opening angle of the accessory and not the site angle of the enclosure Refer to Stacking A10 Wide Focus on KS21 with A TILT p 88 for the list of realized site angles Four Ø11 mm holes are available to secure the assembly to the oor 11 mm hole x4 A10 owner s manual EN version 1 1 35 ...

Page 36: ...ty bars for KS21 Secure KS21 OUTRIG at the bottom of a KS21 array to improve the stability of the array The use of KS21 OUTRIG is mandatory when A10 Wide Focus are stacked on top of KS21 KS21 OUTRIG matches the rigging system of KS21 SHLAK 36 A10 owner s manual EN version 1 1 ...

Page 37: ...4 K2 JACK K2 JACK is a set of two bars and four feet with screw jacks and hand wheels K2 JACK can be tted onto KS21 CHARIOT p 42 to improve stability or correct oor discrepancies During transportation make sure the bolts are tightened bolts x4 feet with screw jacks locking handles hand wheels storage position position in use A10 owner s manual EN version 1 1 37 ...

Page 38: ...Rigging system description 38 A10 owner s manual EN version 1 1 ...

Page 39: ...on the enclosure A MOUNT features two axis the front one can be moved to change the site angle studs angle axis enclosure knob in use wedge clamp position in use The enclosure knob can be stored in an insert on the side The angle axis is secured with a threaded knob To optimize visual impact the knob can be replaced by a locking cotter pin provided enclosure knob stored enclosure knob stored stora...

Page 40: ...ide Focus p 97 for the list of realized site angles X BAR X BAR is a rigging bar for ying A10 Wide Focus The rigging system consists of a threaded axis with a cam lever X BAR is secured to the dedicated inserts on the enclosure in front or rear extension position 40 A10 owner s manual EN version 1 1 ...

Page 41: ...Rigging system description Five angulation holes are available 5 4 3 2 1 X BAR is compatible with a Ø12 mm shackle WLL 1 t provided and with CLAMP250 A10 owner s manual EN version 1 1 41 ...

Page 42: ...ure the lower KS21 KS21 CHARIOT is intended for use only with L Acoustics KS21 Use with other equipment may result in instability causing injury Do not move or transport more than three enclosures on KS21 CHARIOT 1904 mm 75 in KS21 CHARIOT features two brakes for optimal stability Risk of brake damage Do not use the brakes during transportation 42 A10 owner s manual EN version 1 1 ...

Page 43: ...at can be secured to the front of a KS21 with two spring loaded pins KS21 PLA is intended for use only with L Acoustics KS21 Use with other equipment may result in instability causing injury Multiple KS21 PLA can be stacked for storage Turn the wheels outwards to stack KS21 PLA A10 owner s manual EN version 1 1 43 ...

Page 44: ... plate KS21 CHARIOTCOV is a cover for a stack of two to three KS21 on KS21 CHARIOT To t a stack of two KS21 KS21 CHARIOTCOV must be folded inwards and secured with the integrated velcro straps foldable flaps to access the connectors the logo must be on the front face velcro straps inside KS21 COV KS21 CHARIOTCOV 44 A10 owner s manual EN version 1 1 ...

Page 45: ...nery Directive when the other deployment parameters provide the best mechanical conditions For mixed arrays refer to your Soundvision model KS21 con guration rigging accessory safe limit maximum limit Vertical array A15 BUMP 8 16 Vertical array A15 RIGBAR 4 A10 Wide Focus con guration rigging accessory maximum safe limit Flown X BAR 1 Vertical array A10 BUMP 8 Vertical array A10 RIGBAR 4 1 A10 LIF...

Page 46: ...ked to the composition of the array type and number of enclosures splay angles and the implementation of the ying or stacking structure number and location of ying points site angle This cannot be determined without the complex mechanical modeling and calculation offered by Soundvision Assessing the safety with Soundvision The overall safety factor of a speci c mechanical con guration always corre...

Page 47: ...r the nominal bandwidth of the enclosures The A10 preset delivers a reference frequency response in medium throw applications The A10 Wide Focus enclosures are driven by the LA4X LA8 LA12X ampli ed controllers Preset A10 Frequency range 10 dB 66 Hz 20 kHz A10 Focus 67 Hz 20 kHz A10 Wide A10 owner s manual EN version 1 1 47 ...

Page 48: ...x on a reversed subwoofer in a cardioid con guration The cardioid con guration consists in reversing 1 element in an array of 4 subwoofers Refer to the subwoofer owner s manual and to the Cardioid con gurations technical bulletin Grouping subwoofers Place the subwoofer enclosures side by side If not possible the maximum distance between two adjacent acoustic centers must be 1 7 m if the upper freq...

Page 49: ... system operates over the nominal bandwidth of the enclosure The A10_FI preset delivers a reference frequency response in short throw applications The A10 Wide Focus enclosure are driven by the LA4X LA8 LA12X ampli ed controllers Preset A10_FI Frequency range 10 dB 66 Hz 20 kHz A10 Focus 67 Hz 20 kHz A10 Wide A10 owner s manual EN version 1 1 49 ...

Page 50: ...subwoofer in a cardioid con guration The cardioid con guration consists in reversing 1 element in an array of 4 subwoofers Refer to the subwoofer owner s manual and to the Cardioid con gurations technical bulletin Grouping subwoofers Place the subwoofer enclosures side by side If not possible the maximum distance between two adjacent acoustic centers must be 1 7 m if the upper frequency limit of t...

Page 51: ...p 52 on each rigging part Use the Mechanical system overview p 52 to identify critical parts of the system and apply the speci c checks described in the Inspection references p 59 Do the Rigging check p 64 If any parts are damaged contact your L Acoustics representative for further instructions Acoustics Perform the Enclosure check p 66 Perform the Listening test p 68 to detect any degradation in ...

Page 52: ...w is available add blue threadlocker before reusing the screw Do not apply more than the indicated torque 4 Check the geometry of the part to identify critical deformations Place the rigging part on a at surface or hold a level against it 5 Check the moving parts Make sure that the mechanism engages correctly What to do next If a problem is detected perform the authorized maintenance operations or...

Page 53: ...intenance A10 Wide Focus array with A10 BUMP Shackles p 59 the yellow label is present the rigging arm can rotate freely Ball locking pins p 60 Rigging check p 64 Runners and corner stops p 62 A10 owner s manual EN version 1 1 53 ...

Page 54: ...Inspection and preventive maintenance A10 Wide Focus array with A10 RIGBAR Shackles p 59 Ball locking pins p 60 Rigging check p 64 Runners and corner stops p 62 54 A10 owner s manual EN version 1 1 ...

Page 55: ...heck p 64 the front and rear inserts are not damaged Runners and corner stops p 62 A10 Wide Focus with X BAR and CLAMP250 the wing knobs can be tightened and loosened by hand pull up the lever and release it the lever returns to its initial position all screws are tightened the top inserts are not damaged A10 owner s manual EN version 1 1 55 ...

Page 56: ...Inspection and preventive maintenance KS21 array with A15 RIGBAR Shackles p 59 Ball locking pins p 60 Runners and corner stops p 62 Rigging check p 64 56 A10 owner s manual EN version 1 1 ...

Page 57: ... screws are tightened the angle axis is not bent Threaded knobs p 63 make sure that either the locking cotter pin or the knob is present Make sure the pole is compatible with the KS21 pole socket Refer to KS21 p 23 for more information Pole mount socket p 63 Runners and corner stops p 62 A10 owner s manual EN version 1 1 57 ...

Page 58: ... not damaged Rigging check p 64 Runners and corner stops p 62 all screws are tightened Threaded knobs p 63 Runners and corner stops p 62 Ball locking pins p 60 Pole mount socket p 63 Rigging check p 64 Runners and corner stops p 62 the tabs are not bent Runners and corner stops p 62 58 A10 owner s manual EN version 1 1 ...

Page 59: ...reventive 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 52 A10 owner s manual EN version 1 1 59 ...

Page 60: ...ntenance Ball locking pins Tethers are intact and safely secured Test the ball locking mechanism see Moving parts p 61 Reference pictures A15 BUMP A10 BUMP A10 LIFT A15 RIGBAR A10 RIGBAR A TILT 60 A10 owner s manual EN version 1 1 ...

Page 61: ... 3 Insert the pin in each storage and rigging hole Pull and rotate the pin The pin must remain inside the hole 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 Related tasks Rigging part inspection p 52 A10 owner s manual EN version 1 1 61 ...

Page 62: ...e tightened Reference pictures KS21 ground runner KS21 corner stop A10 Wide Focus ground runner A10 Wide Focus corner stop A TILT runner KS21 OUTRIG runner Contact your L Acoustics representative for repair instructions Related tasks Rigging part inspection p 52 62 A10 owner s manual EN version 1 1 ...

Page 63: ...ket Contact your L Acoustics representative for repair instructions Related tasks Rigging part inspection p 52 Threaded knobs Head part does not have cracks Head part is tightly secured to the body part All washers are present Reference pictures A TILT subwoofer knob A TILT and A MOUNT enclosure knob Related tasks Rigging part inspection p 52 A10 owner s manual EN version 1 1 63 ...

Page 64: ...s on both sides SHLAK The rigging arm is removed from its storage position with some resistance When pushing and sliding the mechanism the spring loaded pin is retracted with some resistance Upon release the spring loaded pin quickly returns to its initial position The yellow labels on the rigging arm and on the spring loaded pin are visible when the rigging system is not locked not locked No yell...

Page 65: ...nce 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 SHLAK 4 Switch the enclosures and repeat the procedure A10 owner s manual EN version 1 1 65 ...

Page 66: ...s Do not connect enclosures in parallel Ampli ed controllers LA4X must run at least rmware version 1 1 0 LA4X load sensors must be calibrated Refer to the Load Sensor Calibration Tool technical bulletin for more information LA4X must warm up for at least 10 minutes after power up Do not power off reboot or switch to standby mode to avoid resetting the countdown Load a preset corresponding to the c...

Page 67: ...ites are met in particular that the loaded preset corresponds to the connected speaker s family b inspect the cables and connections c go to step 8 p 67 8 Under NC NOK and UNDEF results press and hold the corresponding OUT key The ampli ed controller displays the tested frequencies information on the measured impedance OPEN for open circuit found in NC results SHORT for short circuit found in NOK ...

Page 68: ...s distorted buzzing rubbing clicking muf ed or weak sound Possible causes The screws are not tightened with the appropriate torque There is an air leak in the gasket There is dust on the cone The cone is damaged The surround is torn or delaminated The voice coil or the spider is damaged Procedure 1 Perform the speaker disassembly procedure 2 Visually inspect the cables and the connectors 3 Visuall...

Page 69: ...used for reassembly are too loose The diaphragm is damaged Procedure 1 Perform the diaphragm disassembly procedure 2 Visually inspect the diaphragm and the voice coil If any damage is visible replace the diaphragm 3 Clean the air gap thoroughly Use double face adhesive tape to remove any particles 4 Perform the diaphragm reassembly procedure Apply the recommended torque 5 Repeat the listening test...

Page 70: ...kle WLL 1 t provided Min number of operators 2 Risk of falling objects Verify that no unattached items remain on the product or assembly Secondary safety Use available holes on the rigging accessories to implement a secondary safety A10 Wide Focus array Procedure 1 Stack up to three enclosures Connect each enclosure on both sides before adding the new one SHLAK 70 A10 owner s manual EN version 1 1...

Page 71: ...des Connect A10 RIGBAR to the top enclosure on both sides CLICK CLICK Final check Visually check that no yellow labels are visible Manually check that all linking points are secured 3 Select the pick up point and raise the array 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 8 9 10 11 12 13 14 F R FRONT A10 owner s manual EN version 1 1 71 ...

Page 72: ...gging system is locked 4 One by one secure additional enclosures under the array Connect each enclosure on both sides before adding the next one SHLAK Final check Visually check that no yellow labels are visible Manually check that all linking points are secured 72 A10 owner s manual EN version 1 1 ...

Page 73: ...ach enclosure on both sides before adding the new one SHLAK 2 Secure A15 BUMP or A15 RIGBAR on top of the array A15 BUMP A15 RIGBAR Connect A15 BUMP to the top KS21 on both sides Connect A15 RIGBAR to the top KS21 on both sides CLICK CLICK A10 owner s manual EN version 1 1 73 ...

Page 74: ...ise the array 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 F R FRONT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 4 Add additional enclosures under the array a Lower the array onto a KS21 or a stack of KS21 on KS21 CHARIOT Align the runners and the tracks b Connect the enclosures on both sides SHLAK c Unlock the KS21 CHARIOT rigging arms 74 A10 owner s manual EN version 1 1 ...

Page 75: ...lly check that no yellow labels are visible Manually check that all linking points are secured 5 Raise the array Disassembly Removing a stack of KS21 Procedure 1 Position a KS21 CHARIOT under the array A10 owner s manual EN version 1 1 75 ...

Page 76: ...eed slowly when lowering the array 2 Lower the array until it rests on KS21 CHARIOT 3 Secure the bottom enclosure to KS21 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 6 Repeat the procedure 76 A10 owner s manual EN version 1 1 ...

Page 77: ...y that no unattached items remain on the product or assembly Assembly Procedure 1 Prepare a vertical array as described in A10 Wide Focus array p 70 2 Raise the array until the bottom enclosure is accessible 3 Secure A10 BUMP or A10 RIGBAR under the array A10 BUMP A10 RIGBAR Connect A10 BUMP to the bottom enclosure on both sides Connect A10 RIGBAR to the bottom enclosure on both sides SHLAK SHLAK ...

Page 78: ...ually check that no yellow labels are visible Manually check that all linking points are secured 4 Secure a shackle to A10 RIGBAR or to pickup point R on A10 BUMP and lift it with an additional motor 78 A10 owner s manual EN version 1 1 ...

Page 79: ...enclosure on which A10 LIFT is secured secure a DIN580 eye bolt to the dedicated insert to implement a secondary safety Use a shackle and a steel wire rope Make sure the steel rope is as tensed as possible without bearing the load A10 LIFT quantity and position Use one A10 LIFT for up to three enclosures in the array Do not leave more than two adjacent enclosures unsupported Refer to APPENDIX A Au...

Page 80: ...locks of up to three enclosures Refer to Preparing a block of enclosures p 83 2 Connect the enclosures at the top Pull the enclosures together to align the rigging SHLAK Final check Visually check that no yellow labels are visible Manually check that all linking points are secured 80 A10 owner s manual EN version 1 1 ...

Page 81: ...0 LIFT bars on the array a Disconnect the ball locking pin at the rear of A10 LIFT b Insert the stub at the front of the enclosure c Insert the stub at the rear and secure the ball locking pin CLICK A10 owner s manual EN version 1 1 81 ...

Page 82: ...om rigging is accessible For this operation stand behind the array 6 Connect the enclosures at the bottom Pull the enclosures together to align the rigging SHLAK 7 Lower the array to select the desired pickup points A10 LIFT pickup point Select the same pickup point on each A10 LIFT within an array of up to 6 enclosures For larger arrays refer to Radial arrays of 7 enclosures and more p 140 82 A10...

Page 83: ...parate the array into blocks of two or three enclosures Connect each enclosure on both sides before adding the new one SHLAK This step requires two operators Make sure all unused rigging arms are in storage position 2 Position the enclosure blocks upright logo on top in two steps Tilt the enclosures on the rear Tilt the enclosures upright 3 Proceed as described in Assembly p 80 A10 owner s manual ...

Page 84: ... point 1 2 3 4 5 6 7 8 9 10 11 12 13 FRONT Make sure the pickup points are on hole 8 before lifting the array 3 Raise the array until the bottom rigging is accessible 4 Disconnect the enclosures at the bottom SHLAK Make sure all unused rigging arms are in storage position 5 Lower the array to the ground 84 A10 owner s manual EN version 1 1 ...

Page 85: ... ying an enclosure or an array use the M8 DIN580 threaded insert to implement a secondary safety Realized site angles realized site angle A10 Focus A10 Wide rear extension front extension rear extension front extension X BAR hole N o 1 11 2 11 1 18 2 7 7 2 0 9 0 1 5 2 4 4 3 9 9 10 6 7 17 4 20 6 21 1 19 7 28 5 5 30 8 31 6 32 39 4 Assembly Procedure 1 Drive the X BAR in the insert A10 owner s manual...

Page 86: ...icular to the front grill Use the lodgings as reference points 3 Tighten the X BAR a Lift the lever and rotate it counter clockwise release the lever and rotate it clockwise Repeat until the X BAR is tightly secured 86 A10 owner s manual EN version 1 1 ...

Page 87: ...Rigging procedures b Finally store the lever on the right 4 Select the site angle and secure a shackle or CLAMP250 5 4 3 2 1 A10 owner s manual EN version 1 1 87 ...

Page 88: ... product or assembly Do not use A TILT in a own array Alternatively mount the KS21 array on KS21 CHARIOT and use K2 JACK to stabilize the array Realized site angles realized site angle selected angle on A TILT A10 Focus A10 Wide 12 5 7 5 2 5 15 10 0 17 5 12 5 2 5 20 15 5 22 5 17 5 7 5 25 20 10 Assembly Procedure 1 Secure KS21 OUTRIG under a KS21 Turn the KS21 upside down to secure KS21 OUTRIG SHLA...

Page 89: ...ach enclosure on both sides before adding the new one SHLAK 3 Select the widest opening position on A TILT 25 4 Place A TILT on A10 Wide Focus using the locating pins for positioning Consider the nal position of the enclosure A10 owner s manual EN version 1 1 89 ...

Page 90: ...s 5 Secure A TILT to the enclosure with the enclosure knob 6 Place the assembly on KS21 7 Adjust the position of A TILT and secure the subwoofer knob inside the pole mounting socket 90 A10 owner s manual EN version 1 1 ...

Page 91: ... downwards 8 Adjust the site angle Insert the angle pins in the selected opening angle on both sides 20 9 Optionally secure additional enclosures on top of the assembly SHLAK Final check Visually check that no yellow labels are visible Manually check that all linking points are secured A10 owner s manual EN version 1 1 91 ...

Page 92: ... KS21 CHARIOT Min number of operators 2 Risk of falling objects Verify that no unattached items remain on the product or assembly Assembly Procedure 1 Engage both brakes on KS21 CHARIOT 2 Place KS21 on KS21 CHARIOT and connect the two elements on both sides SHLAK 92 A10 owner s manual EN version 1 1 ...

Page 93: ...SHLAK 4 Repeat until the stack is complete Final check Visually check that no yellow labels are visible Manually check that all linking points are secured 5 Disengage the brakes and position the stack at its nal position 6 Block the stack using both brakes A10 owner s manual EN version 1 1 93 ...

Page 94: ...cked array Rigging accessory K2 JACK KS21 CHARIOT Min number of operators 1 Assembly Procedure 1 Attach the K2 JACK bars to KS21 CHARIOT on each side a Open the locking handles to insert the studs b Raise and turn the locking handles to secure the bars 94 A10 owner s manual EN version 1 1 ...

Page 95: ...l the central part is close to the base 3 Attach the feet to the bar Insert the feet at both ends of the bar Pivot the central part so that it comes in contact with the bar Lock the feet in position by giving a quarter turn to the locking system A10 owner s manual EN version 1 1 95 ...

Page 96: ...Rigging procedures 4 Rotate the wheels clockwise to raise the array Stop raising the stack as soon as the wheels get off the ground 96 A10 owner s manual EN version 1 1 ...

Page 97: ... to KS21 p 23 to select a compatible pole Realized site angles realized site angle selected angle on A MOUNT A10 Wide A10 Focus 15 0 10 5 10 0 0 15 5 Assembly Procedure 1 Place A MOUNT on the enclosure using the locating pins for positioning Consider the nal position of the enclosure FRONT 2 Remove the angle axis and secure A MOUNT to the enclosure with the threaded knob A10 owner s manual EN vers...

Page 98: ...Rigging procedures 3 Select the site angle and insert the axis in the corresponding hole 5 4 Mount the assembly on a pole and tighten the wedge clamp by hand 98 A10 owner s manual EN version 1 1 ...

Page 99: ... p 104 HF driver p 105 HF diaphragm p 106 For advanced maintenance contact your L Acoustics representative A10 Focus exploded view In order to operate follow the order outlined here Each assembly refers to the corresponding D R procedure and the necessary repair kit LF SPEAKER G03507 GRILL FIN CONNECTOR PLATE HF DRIVER G03506 HF DIAPHRAGM G03508 A10 owner s manual EN version 1 1 99 ...

Page 100: ... bit Repair kit G03507 KR loudspeaker 10 A10 FOCUS WIDE 2 S100202 M6 30 Torx Exploded view For safety reasons always use the new screws and spare parts provided in the KR If no new screws are available use blue threadlocker x2 T30 100 A10 owner s manual EN version 1 1 ...

Page 101: ...x Prerequisite Grill removed See Grill p 100 Exploded view For safety reasons always use the new screws and spare parts provided in the KR If no new screws are available use blue threadlocker Use a at tool made of smooth plastic to avoid scratching the ns With the at tool unhook the n clips one by one 2 1 x4 3 N m T30 A10 owner s manual EN version 1 1 101 ...

Page 102: ...17922 S100228 102325 10 LF speaker 8 Ω M5x25 Torx 10 speaker gasket Prerequisite Grill removed See Grill p 100 Fin removed See Fin p 101 Exploded view For safety reasons always use the new screws and spare parts provided in the KR If no new screws are available use blue threadlocker x4 3 N m T25 102 A10 owner s manual EN version 1 1 ...

Page 103: ...Corrective maintenance If the speaker gasket is damaged remove and replace it What to do next Perform the Acoustical check p 66 procedures A10 owner s manual EN version 1 1 103 ...

Page 104: ...6 Torx Exploded view 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 Use a at tool as a lever to remove the connector plate Position the connector plate with the connectors towards the middle of the enclosure x6 3 N m T25 104 A10 owner s manual EN version 1 1 ...

Page 105: ...08 KR diaphragm A10 FOCUS WIDE Prerequisite Connector plate removed See Connector plate p 104 Exploded view For safety reasons always use the new screws and spare parts provided in the KR If no new screws are available use blue threadlocker Carefully disconnect the cables before removing the driver assembly Use the positive red connector as a reference point to position the driver assembly x2 5 N ...

Page 106: ...Connector plate removed See Connector plate p 104 HF driver removed from the cabinet See HF driver p 105 The driver is placed on a at surface in a dust free environment Disassembly Procedure 1 Remove the four screws securing the cover Use the T20 Torx bit 2 Remove the cover 3 Carefully remove the diaphragm 4 If there are shims on the dome carefully remove them Take note of how many and what kind o...

Page 107: ...ve any particle 2 Place the same kind and number of shims that were initially present 3 Carefully place the diaphragm using the positive red connector as reference point 4 Position the cover and turn it to align it with the screw holes Gradually tighten the screws following a star pattern 5 Secure the cover using four S18085 screws Use the T20 Torx bit Set the torque to 3 5 Nm What to do next Perf...

Page 108: ...iver p 114 HF diaphragm p 115 For advanced maintenance contact your L Acoustics representative A10 Wide exploded view In order to operate follow the order outlined here Each assembly refers to the corresponding D R procedure and the necessary repair kit LF SPEAKER G03507 GRILL FIN HF DIAPHRAGM G03508 CONNECTOR PLATE HF DRIVER G03506 108 A10 owner s manual EN version 1 1 ...

Page 109: ... bit Repair kit G03507 KR loudspeaker 10 A10 FOCUS WIDE 2 S100202 M6 30 Torx Exploded view For safety reasons always use the new screws and spare parts provided in the KR If no new screws are available use blue threadlocker x2 T30 A10 owner s manual EN version 1 1 109 ...

Page 110: ...x Prerequisite Grill removed See Grill p 109 Exploded view For safety reasons always use the new screws and spare parts provided in the KR If no new screws are available use blue threadlocker Use a at tool made of smooth plastic to avoid scratching the ns With the at tool unhook the n clips one by one 1 2 x4 3 N m T30 110 A10 owner s manual EN version 1 1 ...

Page 111: ...17922 S100228 102325 10 LF speaker 8 Ω M5x25 Torx 10 speaker gasket Prerequisite Grill removed See Grill p 109 Fin removed See Fin p 110 Exploded view For safety reasons always use the new screws and spare parts provided in the KR If no new screws are available use blue threadlocker x4 3 N m T25 A10 owner s manual EN version 1 1 111 ...

Page 112: ...Corrective maintenance If the speaker gasket is damaged remove and replace it What to do next Perform the Acoustical check p 66 procedures 112 A10 owner s manual EN version 1 1 ...

Page 113: ...6 Torx Exploded view 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 Use a at tool as a lever to remove the connector plate Position the connector plate with the connectors towards the middle of the enclosure x6 3 N m T25 A10 owner s manual EN version 1 1 113 ...

Page 114: ...08 KR diaphragm A10 FOCUS WIDE Prerequisite Connector plate removed See Connector plate p 113 Exploded view For safety reasons always use the new screws and spare parts provided in the KR If no new screws are available use blue threadlocker Carefully disconnect the cables before removing the driver assembly Use the positive red connector as a reference point to position the driver assembly x2 5 N ...

Page 115: ...Connector plate removed See Connector plate p 113 HF driver removed from the cabinet See HF driver p 114 The driver is placed on a at surface in a dust free environment Disassembly Procedure 1 Remove the four screws securing the cover Use the T20 Torx bit 2 Remove the cover 3 Carefully remove the diaphragm 4 If there are shims on the dome carefully remove them Take note of how many and what kind o...

Page 116: ...ve any particle 2 Place the same kind and number of shims that were initially present 3 Carefully place the diaphragm using the positive red connector as reference point 4 Position the cover and turn it to align it with the screw holes Gradually tighten the screws following a star pattern 5 Secure the cover using four S18085 screws Use the T20 Torx bit Set the torque to 3 5 Nm What to do next Perf...

Page 117: ...bars p 119 LF speaker p 120 For advanced maintenance contact your L Acoustics representative KS21 exploded view In order to operate follow the order outlined here Each assembly refers to the corresponding D R procedure and the necessary repair kit GRILL FIXING BARS LF SPEAKER G03409 A10 owner s manual EN version 1 1 117 ...

Page 118: ...orx bit Repair kit G03409 KR loudspeaker 21 KS21 2 S221 M6 35 Torx Exploded view For safety reasons always use the new screws and spare parts provided in the KR If no new screws are available use blue threadlocker x2 3 N m T30 118 A10 owner s manual EN version 1 1 ...

Page 119: ...erequisite Grill removed See Grill p 118 Exploded view For safety reasons always use the new screws and spare parts provided in the KR If no new screws are available use blue threadlocker Slide the xing bars under the vent panel to attach them to the studs then secure them with the screws x2 5 N m T30 A10 owner s manual EN version 1 1 119 ...

Page 120: ...r 8 Ω 21 speaker gasket M6 35 Torx Prerequisite Grill removed See Grill p 118 Exploded views For safety reasons always use the new screws and spare parts provided in the KR If no new screws are available use blue threadlocker Tilt the speaker to remove it from the cabinet Carefully disconnect the cables x6 5 N m T30 120 A10 owner s manual EN version 1 1 ...

Page 121: ...Corrective maintenance If the speaker gasket is damaged remove and replace it A10 owner s manual EN version 1 1 121 ...

Page 122: ...Vents bass re ex HF DOSC waveguide L Fins Nominal impedance 8 Ω Connectors 2 4 point speakON Rigging and handling ush tting 2 point rigging system 2 handle 8 corner stop 2 ground runner 1 DIN580 compatible M8 threaded insert Weight net 20 kg 44 lb Cabinet premium grade Baltic beech and birch plywood Front coated steel grill acoustically neutral 3D fabric Rigging components high grade steel with an...

Page 123: ...Speci cations A10 Wide dimensions 581 mm 22 9 in 347 mm 13 7 in 180 mm 7 in 344 mm 13 5 in 569 mm 22 4 in 367 mm 14 5 in A10 owner s manual EN version 1 1 123 ...

Page 124: ...ass re ex HF DOSC waveguide L Fins Nominal impedance 8 Ω Connectors 2 4 point speakON Rigging and handling ush tting 2 point rigging system 2 handles 8 corner stop 2 ground runner 1 DIN580 compatible M8 threaded insert Weight net 22 kg 49 lb Cabinet premium grade Baltic beech and birch plywood Front coated steel grill acoustically neutral 3D fabric Rigging components high grade steel with anti cor...

Page 125: ...Speci cations A10 Focus dimensions 581 mm 22 9 in 350 mm 13 8 in 569 mm 22 4 in 339 mm 13 3 in 367 mm 14 5 in 292 mm 11 5 in 354 mm 13 9 in A10 owner s manual EN version 1 1 125 ...

Page 126: ...int speakON LINK 1 4 point speakON Rigging and handling ush tting 2 point rigging system 4 handles 8 corner stops 2 ground runners 1 pole mount with M20 150 insert Weight net 49 kg 108 lb Cabinet premium grade Baltic beech and birch plywood Front coated steel grill acoustically neutral 3D fabric Rigging components high grade steel with anti corrosion coating Finish dark grey brown Pantone 426 C 1 ...

Page 127: ...Speci cations KS21 dimensions 571 mm 22 5 in 764 mm 30 in 576 mm 22 7 in 569 mm 22 4 in 602 mm 23 7 in 752 mm 29 6 in 620 mm 24 4 in 575 mm 22 6 in A10 owner s manual EN version 1 1 127 ...

Page 128: ...osion coating A10 BUMP dimensions 50 mm 2 in 569 mm 22 4 in 445 mm 17 5 in 501 mm 19 7 in A10 LIFT speci cations Description Rigging element for horizontal deployment of A10 1 Ø12 mm shackle WLL 1 t Weight net 2 kg 4 4 lb Material high grade steel with anti corrosion coating A10 LIFT dimensions 50 mm 2 in 25 mm 1 in 139 mm 5 5 in 475 mm 18 7 in 128 A10 owner s manual EN version 1 1 ...

Page 129: ...g bar and pullback for A10 2 Ø12 mm shackles WLL 1 t Weight net 3 5 kg 7 7 lb Material high grade steel with anti corrosion coating A10 RIGBAR dimensions 89 mm 3 5 in 57 mm 2 2 in 567 mm 22 3 in 18 mm 0 7 in 10 mm 0 4 in A10 owner s manual EN version 1 1 129 ...

Page 130: ... mm 14 2 in 415 mm 16 3 in 127 mm 5 in KS21 OUTRIG speci cations Speci cations for one KS21 OUTRIG bar Always use in pairs Description Stability bars for KS21 Weight net 3 5 kg 7 7 lb Rigging and handling 2 ground runners Material high grade steel with anti corrosion coating high density polyethylene runners KS21 OUTRIG dimensions 900 mm 35 4 in 55 mm 2 2 in 68 3 mm 2 7 in 130 A10 owner s manual E...

Page 131: ...e mount for A15 and A10 Weight net 1 1 kg 2 4 lb Material high grade steel with anti corrosion coating A MOUNT dimensions Ø 36 mm 1 4 in 152 mm 6 in 68 mm 2 7 in 152 mm 6 in 97 mm 3 8 in 131 mm 5 1 in 115 mm 4 5 in A10 owner s manual EN version 1 1 131 ...

Page 132: ...on Rigging bar for 1 enclosure 1 Ø12 mm shackle WLL 1 t Weight net 1 1 kg 2 4 lb Material high grade steel with anti corrosion coating X BAR dimensions 185 mm 7 3 in Ø 13 mm 0 5 in 83 mm 3 3 in 85 mm 3 3 in 132 A10 owner s manual EN version 1 1 ...

Page 133: ...ame for vertical deployment of A15 and KS21 2 Ø12 mm shackles WLL 1 t Weight net 19 kg 42 lb Material high grade steel with anti corrosion coating A15 BUMP dimensions 77 mm 3 in 656 mm 25 8 in 600 mm 23 6 in 754 mm 29 7 in A10 owner s manual EN version 1 1 133 ...

Page 134: ...r and pullback for A15 and KS21 2 Ø12 mm shackles WLL 1 t Weight net 4 6 kg 10 lb Material high grade steel with anti corrosion coating A15 RIGBAR dimensions 750 mm 29 5 in 64 mm 2 5 in 18 mm 0 7 in 89 mm 3 5 in 10 mm 0 4 in 134 A10 owner s manual EN version 1 1 ...

Page 135: ...ions KS21 CHARIOT speci cations Description Chariot for up to 3 KS21 Weight net 23 6 kg 52 lb KS21 CHARIOT dimensions 712 mm 28 in 840 mm 33 in 67 8 mm 2 6 in 225 mm 8 9 in A10 owner s manual EN version 1 1 135 ...

Page 136: ...4 tilt adjustment screw jacks bar for K2 CHARIOT Weight net 10 1 kg 22 3 lb for one stabilizer Material high grade steel with anti corrosion coating K2 JACK dimensions 426 mm 16 8 in 1278 mm 50 3 in 124 mm 4 9 in 136 A10 owner s manual EN version 1 1 ...

Page 137: ...eci cations Description Clamp certi ed for 250 kg Weight net 1 8 kg 4 lb Material high grade steel with anti corrosion coating CLAMP250 dimensions 167 mm 6 6 in 103 mm 4 1 in 227 mm 8 9 in A10 owner s manual EN version 1 1 137 ...

Page 138: ...tions KS21 PLA speci cations Description Removable front dolly for 1 KS21 Weight net 9 5 kg 21 lb KS21 PLA dimensions 148 mm 5 8 in 20 mm 0 8 in 569 mm 22 4 in 738 mm 29 in 138 A10 owner s manual EN version 1 1 ...

Page 139: ...e A10 LIFT for up to three enclosures in the array Do not leave more than two adjacent enclosures unsupported A10 LIFT pickup point Select the same pickup point on each A10 LIFT within an array of up to 6 enclosures For larger arrays refer to Radial arrays of 7 enclosures and more p 140 Risk of tilting When using a single motor or a bridle make sure the array is symmetrical When using a third part...

Page 140: ...o the illustrations to distribute the A10 LIFT bars on the array In radial arrays of 7 enclosures and more make sure the site angle is 0 Position the pickup points so that the center of gravity is in the middle of the array 7 enclosures 3 A10 LIFT 8 enclosures 4 A10 LIFT 9 enclosures 3 A10 LIFT Array setup information type number of enclosures number of motors setup point pickup point for 0 site a...

Page 141: ... sensors are compatible with the new TEQSAS LAP TEQ PLUS displays Conversely the new sensors are not compatible with the legacy displays With two sets of xation points and slit openings the position and orientation of the laser support plate can be adapted to every use of the rigging frame slit openings fixation points left fixation points right Calibrating the inclinometer Refer to the manufactur...

Page 142: ...provides the recommended 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 Ω load 4 Ω load 2 7 Ω load mm 2 SWG AWG m ft m ft m ft 2 5 15 13 30 100 15 50 10 33 4 13 11 50 160 25 80 17 53 6 11 9 74 240 37 120 25 80 Use the more detailed L Acoustics calculation tool to evaluate cable length a...

Page 143: ...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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