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Loudspeaker configurations

K2/SB28 user manual (EN) version 4.0

Additional subwoofer system

A K2 line source or a K2/K1-SB line source can be deployed with additional subwoofer enclosures to provide increased

sub-low resources to demanding applications.
Two subwoofer systems are available:

— K1-SB for increased LF contour
— SB28 for infra extension

The recommended ratio is 3 K2 for 2 subwoofers, whether using K1-SB subwoofers only, SB28 subwoofers only, or a

combination of both.
The [K1SB_60] and [SB28_60] presets provide the subwoofers with an upper frequency limit at 60 Hz for an optimal

frequency coupling with the line source.
The K1-SB and SB28 subwoofer enclosures are driven by the LA8 amplified controller.

K1-SB

The K1-SB provides an extension of the bandwidth in the low end, down to 30 Hz. Depending on the deployment, LF

rejection can be produced.
Three deployments are available in this configuration:

— K1-SB on top of the K2 line source
— K1-SB beside the K2 or K2/K1-SB line source : side LF rejection (polarized)
— K1-SB behind the K2 or K2/K1-SB line source : rear LF rejection (cardioid)

Содержание K2/SB28

Страница 1: ...K2 SB28 user manual EN ...

Страница 2: ... manual EN version 4 0 Distribution date April 4 2016 2016 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 ...

Страница 3: ...9 Line source 9 Additional subwoofer system 11 K1 SB 11 SB28 15 Loudspeaker connection 17 Connectors 17 Connection to LA4X 18 Connection to LA8 19 Preset description 21 Recommendation for speaker cables 22 Illustrations 23 Loudspeaker cables 23 Specifications 24 K2 specifications 24 K2 dimensions 25 K1 SB specifications 26 K1 SB dimensions 26 SB28 specifications 27 SB28 dimensions 27 ...

Страница 4: ...ximum sound levels and exposure times 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...

Страница 5: ...y Carefully read this document in order to become familiar with the system As part of a continuous evolution of techniques and standards L Acoustics reserves the right to change the specifications 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 ...

Страница 6: ... point speakON DO cables 8 point PA COM loudspeaker cables 4 mm gauge DO cables come 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 speakON to PA COM interface cable for one 3 way active enclosure 2 x 4 point speakON to 8 point PA COM This cable is not provided and needs to b...

Страница 7: ...le horizontal directivity system Using the adjustable fins horizontal directivity can be adjusted with four different settings 110 70 symmetric or 90 asymmetric 35 55 or 55 35 A specific K2 preset must be used for each directivity setting Within a line source different directivity settings can be combined to improve the coverage of the audience geometry ...

Страница 8: ... line source for enhanced throw using the K1SB_X K2 preset with K2 As a subwoofer for increased impact using the K1SB_60 preset Both applications of K1 SB can be combined in the same configuration K1 SB as an LF extension in a line source K1 SB as a subwoofer K2 LINE SOURCE K2 K1 SB LINE SOURCE K2 LINE SOURCE K2 K1 SB LINE SOURCE ENHANCED THROW INCREASED IMPACT ...

Страница 9: ...e frequency response in long throw applications Each preset is dedicated to a horizontal directivity setting By providing the K1 SB with the same frequency response as the K2 low section the K1SB_X K2 preset allows the K1 SB enclosure to be used as an LF line source element increasing the length of the sub low line source The K2 enclosures are driven by the LA4X LA8 amplified controllers The K1 SB...

Страница 10: ..._X K2 K2 70 K2 90 K2 110 PRESET Enclosure K2 K1 SB Preset K2 70 K2 90 K2 110 K1SB_X K2 Frequency range 10 dB 35 Hz 20 kHz Recommended ratio 3 K2 1 K1 SB Minimum line length 12 K2 4 K1 SB When using K2 with K1SB_X K2 do not add any delay value between the K2 and K1 SB elements of a same line source ...

Страница 11: ...ofers only or a combination of both The K1SB_60 and SB28_60 presets provide the subwoofers with an upper frequency limit at 60 Hz for an optimal frequency coupling with the line source The K1 SB and SB28 subwoofer enclosures are driven by the LA8 amplified controller K1 SB The K1 SB provides an extension of the bandwidth in the low end down to 30 Hz Depending on the deployment LF rejection can be ...

Страница 12: ...losure K2 K1 SB as subwoofer Preset K2 70 K2 90 K2 110 K1SB_60 Frequency range 10 dB 30 Hz 20 kHz Recommended ratio 3 K2 2 subwoofers Maximum number line length 12 K2 4 K1 SB Delay values Do not forget to add the pre alignment and geometric delays depending on the configuration Pre alignment delays K2 K1SB_60 K2 6 ms K1 SB 0 ms ...

Страница 13: ...90 K2 110 K1SB_X K2 K1SB_60 Frequency range 10 dB 30 Hz 20 kHz Recommended ratio 3 K2 2 subwoofers Recommended spacing between side panels Between 0 5 m 1 5 ft and 1 m 3 ft Delay values Do not forget to add the pre alignment and geometric delays depending on the configuration When using K2 with K1SB_X K2 do not add any delay value between the K2 and K1 SB elements of a same line source Pre alignme...

Страница 14: ...y range 10 dB 30 Hz 20 kHz Recommended ratio 3 K2 2 subwoofers Recommended spacing between front faces Between 1 5 m 5 ft and 2 m 7 ft Delay values Do not forget to add the pre alignment and geometric delays depending on the configuration When using K2 with K1SB_X K2 do not add any delay value between the K2 and K1 SB elements of a same line source Pre alignment delays K2 K1SB_60 K2 6 ms K1 SB 0 m...

Страница 15: ...0 dB 25 Hz 20 kHz Recommended ratio 3 K2 2 subwoofers Grouping subwoofers Place the subwoofer enclosures side by side If not possible the maximum distance between two adjacent acoustic centers must be 2 8 m or 1 7 m if the upper frequency limit of the subwoofer system is at 60 Hz or 100 Hz respectively Use xxxx_xx_C on a reversed subwoofer in a cardioid configuration The cardioid configuration con...

Страница 16: ...elays depending on the configuration When using K2 with K1SB_X K2 do not add any delay value between the K2 and K1 SB elements of a same line source Pre alignment delays K2 SB28_60 K2 0 ms SB28 6 ms K2 SB28_60_C K2 0 ms SB28 0 5 ms K2 K1SB_60 SB28_60 K2 8 ms K1 SB 2 ms SB28 0 ms K2 K1SB_60 SB28_60_C K2 13 5 ms K1 SB 7 5 ms SB28 0 ms ...

Страница 17: ...l pinout for L ACOUSTICS 3 way active enclosures PA COM points A B C D E F G H Transducer connectors left LF right LF MF HF The K1 SB is equipped with one 4 point speakON connector K1 SB IN The SB28 is equipped with one 4 point speakON connector IN SB28 Internal pinout for L ACOUSTICS subwoofers speakON points 1 1 2 2 Transducer connectors LF LF Not linked Not linked ...

Страница 18: ... load K2 1 enclosure LF 8 Ω MF 8 Ω HF 16 Ω 2 enclosures in parallel LF 4 Ω MF 4 Ω HF 8 Ω Connecting 3 way active enclosures 3 way active enclosure on speakON output custom speakON to PA COM interface L Acoustics does not supply the speakON to PA COM interface It must be built with two 4 point speakON connectors and a female 8 point PA COM connector no cable clamp OUT1 OUT2 OUT3 OUT4 speakON to PA ...

Страница 19: ... 8 Ω HF 16 Ω 2 enclosures in parallel LF 4 Ω MF 4 Ω HF 8 Ω 3 enclosures in parallel LF 2 7 Ω MF 2 7 Ω HF 5 2 Ω SB28 K1 SB 1 enclosure 4 Ω Connecting 3 way active enclosures 3 way active enclosure on CA COM output DO CA COM DO DO Connecting subwoofers Cardioid configuration Connect the reversed subwoofer s to OUT 1 to use the cardioid preset Subwoofer on speakON output SP SP Y1 OUT1 OUT2 OUT3 OUT4 ...

Страница 20: ...Loudspeaker connection K2 SB28 user manual EN version 4 0 20 Subwoofer on CA COM output DO DOSUB LA8 CA COM DO DOSUB LA8 SP1 OUT1 SP2 OUT2 SP3 OUT3 SP4 OUT4 ...

Страница 21: ...dB 0 ms ON OUT 3 SB IN A 0 dB 0 ms ON OUT 4 SB IN A 0 dB 0 ms ON SB28_60_C loudspeaker elements outputs channels routing gain delay polarity mute SR OUT 1 SR ON SB OUT 2 SB ON SB OUT 3 SB ON SB OUT 4 SB IN A 0 dB 0 ms ON K2 70 K2 90 K2 110 loudspeaker elements outputs channels routing gain delay polarity mute left LF OUT 1 LF ON right LF OUT 2 LF ON MF OUT 3 MF ON HF OUT 4 HF IN A 0 dB 0 ms ON ...

Страница 22: ...ble below provides the recommended maximum length for loudspeaker cables depending on the cable gauge and on the impedance load connected to the amplifier 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 For your installation projects you can use the more detailed L ACO...

Страница 23: ...cable 5 m 16 4 ft SP10 4 point speakON loudspeaker cable 10 m 32 8 ft SP25 4 point speakON loudspeaker cable 25 m 82 ft DO 7 8 point PA COM loudspeaker cable 0 7 m 2 3 ft DO10 8 point PA COM loudspeaker cable 10 m 32 8 ft DO25 8 point PA COM loudspeaker cable 25 m 82 ft DOSUB LA8 breakout cable for four passive enclosures SP Y1 breakout cable for two passive enclosures ...

Страница 24: ...ression driver DOSC waveguide Acoustical load bass reflex Nominal impedance LF 2 x 8 Ω MF 8 Ω HF 16 Ω Connectors IN 1 x 8 point PA COM LINK 1 x 8 point PA COM Rigging and handling captive 4 point rigging system inter enclosure angles 0 25 1 2 3 4 5 7 5 or 10 Weight net 56 kg 123 2 lb Cabinet first grade Baltic birch plywood Front high grade steel grill with anti corrosion coating acoustically neut...

Страница 25: ...Specifications 25 K2 SB28 user manual EN version 4 0 K2 dimensions 400 mm 15 8 in 1338 mm 52 7 in 286 mm 11 3 in 354 mm 13 9 in ...

Страница 26: ...ing and handling captive 4 point rigging system 0 0 5 1 1 5 2 2 5 3 4 or 5 handles integrated into the cabinet Weight net 83 kg 183 lb Cabinet first grade Baltic birch plywood Finish dark grey brown Pantone 426C Front high grade steel grill with anti corrosion coating acoustically neutral 3D fabric Rigging components high grade steel with anti corrosion coating 1 Peak level measured at 1 m under h...

Страница 27: ...tors IN 1 4 point speakON Rigging and handling integrated rigging system handles integrated in the cabinet Weight net 93 kg 205 lb Cabinet first grade Baltic birch plywood Finish dark grey brown Pantone 426C Front high grade steel grill with anti corrosion coating acoustically neutral 3D fabric Rigging components aluminium 1 Peak level measured at 1 m under half space conditions using 10 dB crest ...

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