K2/SB28 user manual
K2/SB28
user manual (EN)
Document reference: K2/SB28 user 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.
Contents
Safety................................................................................................................................................................ 4
Instructions................................................................................................................................................4
Symbols................................................................................................................................................... 4
Welcome........................................................................................................................................................... 5
System components.............................................................................................................................................6
Technical description...........................................................................................................................................7
K2 horizontal directivity settings................................................................................................................. 7
K1-SB applications.................................................................................................................................... 8
Loudspeaker configurations.................................................................................................................................. 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
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.
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.
Refer to 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 notifies the user about instructions that must be strictly followed to ensure proper installation or
operation of the product.
This symbol notifies the user about complementary information or optional instructions.
K2/SB28 user manual (EN) version 4.0
4
Welcome
Welcome
Thank you for purchasing the L-Acoustics K2.
This document contains essential information on using the system properly. 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.
5
K2/SB28 user manual (EN) version 4.0
System components
System components
Loudspeaker enclosures
K2
3-way full-range active WST enclosure
K1-SB
K1-SB system subwoofer 2 x15"
SB28
high power subwoofer 2×18"
Powering and driving system
LA4X / LA8
amplified controller with DSP, preset library and networking capabilities
LA-RAK
touring rack containing three LA8, for power, audio and network distribution
L-Case
protection case for L-Acoustics 2U electronics
Refer to the LA4X / LA8 user manual for operating instructions.
Loudspeaker cables
SP cables
4-point speakON loudspeaker cables (4 mm² gauge)
SP cables come in four sizes: SP.7 (0.7 m/2.3 ft), SP5 (5 m/16.4 ft), SP10 (10 m/32.8 ft) and
SP25 (25 m/82 ft)
SP-Y1
breakout cable for two passive enclosures (2.5 mm² gauge) provided with a CC4FP adapter
4-point speakON to 2 × 2-point speakON
DO cables
8-point PA-COM loudspeaker cables (4 mm² 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 mm² gauge)
8-point PA-COM to 4 × 2-point speakON
speakON to PACOM 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 be custom made.
Information about the connection of the enclosures to the LA amplifiers is given in this
document.
Refer to the LA4X / LA8 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 K2 rigging manual.
Software applications
Soundvision
3D acoustical and mechanical modeling software
LA Network
Manager
software for remote control and monitoring of amplified controllers
Refer to the LA Network Manager video tutorial.
Refer to the Soundvision help.
K2/SB28 user manual (EN) version 4.0
6
Technical description
Technical description
K2 horizontal directivity settings
The K2 enclosure features an adjustable 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.
7
K2/SB28 user manual (EN) version 4.0
Technical description
K1-SB applications
There are two distinct applications for K1-SB in a K2 system:
— As an LF extension in a 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 a subwoofer
K2 LINE SOURCE /
K2/K1-SB LINE SOURCE
K2 LINE SOURCE /
K2/K1-SB LINE SOURCE
K1-SB as an LF extension in a line source
ENHANCED THROW
K2/SB28 user manual (EN) version 4.0
INCREASED IMPACT
8
Loudspeaker configurations
Loudspeaker configurations
Line source
Deployed as a line source, the system operates over the nominal bandwidth of the K2 enclosure, with an adjustable
horizontal directivity.
Two configurations are possible:
— K2 line source
— K2/K1-SB line source: enhanced LF throw
The [K2 70], [K2 90] and [K2 110] presets allow for a reference 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 enclosures are driven by the LA8 amplified controller.
Standalone K2 line source
[PRESET]
[K2 70] / [K2 90] / [K2 110]
Enclosure K2
Preset [K2 70] [K2 90] [K2 110]
Frequency range (-10 dB) 35 Hz - 20 kHz
9
K2/SB28 user manual (EN) version 4.0
Loudspeaker configurations
K2/K1-SB line source
[PRESET]
[K1SB_X K2]
[PRESET]
[K2 70] / [K2 90] / [K2 110]
Enclosure K2
Preset [K2 70] [K2 90] [K2 110]
K1-SB
[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.
K2/SB28 user manual (EN) version 4.0
10
Loudspeaker configurations
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)
11
K2/SB28 user manual (EN) version 4.0
Loudspeaker configurations
Line source with K1-SB on top
K2 LINE SOURCE
[PRESET]
[K1SB_60]
Enclosure K2
Preset [K2 70][K2 90][K2 110]
K1-SB as subwoofer
[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/SB28 user manual (EN) version 4.0
K2 = 6 ms
K1-SB = 0 ms
12
Loudspeaker configurations
Line source with K1-SB beside
0.5 to 1 m
(1.5 to 3 ft)
K2 LINE SOURCE /
K2/K1-SB LINE SOURCE
[PRESET]
[K1SB_60]
Enclosure K2
Preset [K2 70][K2 90][K2 110]
K1-SB in line source
K1-SB as subwoofer
[K1SB_X K2]
[K1SB_60]
Frequency range (-10 dB) 30 Hz - 20 kHz
Recommended ratio 3 K2 : 2 subwoofers
Recommended spacing Between 0.5 m (1.5 ft) and 1 m (3 ft)
between side panels
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]
13
K2 = 6 ms
K1-SB = 0 ms
K2/SB28 user manual (EN) version 4.0
Loudspeaker configurations
Line source with K1-SB behind
1.5 to 2 m
(5 to 7 ft)
K2 LINE SOURCE /
K2/K1-SB LINE SOURCE
[PRESET]
[K1SB_60]
Enclosure K2
Preset [K2 70][K2 90][K2 110]
K1-SB in line source
K1-SB as subwoofer
[K1SB_X K2]
[K1SB_60]
Frequency range (-10 dB) 30 Hz - 20 kHz
Recommended ratio 3 K2 : 2 subwoofers
Recommended spacing Between 1.5 m (5 ft) and 2 m (7 ft)
between front faces
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 ms
Geometric delays
1.5 m (5 ft)
Line source = 4.5 ms
2 m (7 ft)
Line source = 6 ms
K2/SB28 user manual (EN) version 4.0
14
Loudspeaker configurations
SB28
The SB28 provides an extension of the bandwidth in the low end, down to 25 Hz.
K2 LINE SOURCE /
K2/K1-SB LINE SOURCE
Line source with SB28
[PRESET]
[SB28_60]
Enclosure K2
Preset [K2 70][K2 90][K2 110]
K1-SB in line
source
K1-SB as
subwoofer
SB28
[K1SB_X]
[K1SB_60]
[SB28_60]
Frequency range (-10 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 consists in reversing 1 element in an array of 4 subwoofers.
Refer to the subwoofer user manual and to the Cardioid configurations technical bulletin.
15
K2/SB28 user manual (EN) version 4.0
Loudspeaker configurations
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] + [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
K2/SB28 user manual (EN) version 4.0
16
Loudspeaker connection
Loudspeaker connection
Connectors
The K2 is equipped with two 8-point PA-COM connectors.
K2
IN
LINK
Internal pinout for L-ACOUSTICS 3-way active enclosures
PA-COM points
A/B
Transducer connectors left LF
C/D
E/F
G/H
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.
SB28
IN
Internal pinout for L-ACOUSTICS subwoofers
speakON points
1+
1-
2+
2-
Transducer connectors LF +
LF -
Not linked
Not linked
17
K2/SB28 user manual (EN) version 4.0
Loudspeaker connection
Connection to LA4X
Maximum number of enclosures per LA4X
enclosure
max enclosures in parallel
max enclosures per controller
K2
1
1
Impedance 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).
speakON to PA-COM
OUT1/OUT2
OUT3/OUT4
K2/SB28 user manual (EN) version 4.0
18
Loudspeaker connection
Connection to LA8
Maximum number of enclosures per LA8
enclosure
max enclosures in parallel
max enclosures per controller
K2
3
3
K1-SB
1
4
SB28
1
4
Impedance 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
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
DO
DO
CA-COM
Connecting subwoofers
Cardioid configuration
Connect the reversed subwoofer(s) to OUT 1 to use the cardioid preset.
Subwoofer on speakON output - SP + SP-Y1
CH1 (OUT1)
SP
OUT1/OUT2
OUT3/OUT4
SP-Y1
CC4FP
CH2 (OUT2)
same as OUT1/OUT2
19
K2/SB28 user manual (EN) version 4.0
Loudspeaker connection
Subwoofer on CA-COM output - DO + DOSUB-LA8
SP1 (OUT1)
DOSUB-LA8
CA-COM
SP2 (OUT2)
SP3 (OUT3)
DO
SP4 (OUT4)
K2/SB28 user manual (EN) version 4.0
20
Preset description
Preset description
[K1SB_60] [K1SB_X K2] [SB28_60]
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
[SB28_60_C]
loudspeaker elements
outputs
channels
routing
gain
delay
polarity
mute
SR
OUT 1
SR
IN A
0 dB
0 ms
+
ON
SB
OUT 2
SB
ON
SB
OUT 3
SB
ON
SB
OUT 4
SB
ON
outputs
channels
routing
gain
delay
polarity
mute
left LF
OUT 1
LF
IN A
0 dB
0 ms
+
ON
right LF
OUT 2
LF
ON
MF
OUT 3
MF
ON
HF
OUT 4
HF
ON
[K2 70] [K2 90] [K2 110]
loudspeaker elements
21
K2/SB28 user manual (EN) version 4.0
Recommendation for speaker cables
Recommendation for speaker cables
Follow the recommended maximum length for loudspeaker cables to ensure minimal SPL attenuation.
Cable quality and resistance
Only use high-quality fully insulated speaker cables made of stranded copper wire.
Use cables with a gauge offering low resistance per unit length and keep the cables as short as possible.
The table below provides the recommended maximum length for loudspeaker cables depending on the cable gauge and
on the impedance load connected to the amplifier.
cable gauge
recommended maximum length
8 Ω load
mm
2
4 Ω load
2.7 Ω load
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-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:
http://www.l-acoustics.com/installation-outils-de-calcul-1367.html
K2/SB28 user manual (EN) version 4.0
22
Illustrations
Illustrations
Loudspeaker cables
23
SP.7
4-point speakON loudspeaker cable (0.7 m / 2.3 ft)
SP5
4-point speakON loudspeaker 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
K2/SB28 user manual (EN) version 4.0
Specifications
Specifications
K2 specifications
Description
3-way full-range active WST enclosure, quad-amplified by LA4X / LA8
Usable bandwidth (-10 dB)
1
35 Hz - 20 kHz ([K2 70])
Maximum SPL
145 dB ([K2 70])
Nominal directivity
horizontal: 110° / 70° symmetric or 90° asymmetric (35°/55° or 55°/35°)
vertical: dependent upon the number of elements and the line source curvature
Transducers
LF: 2 x 12"
MF: 4 x 6.5"
HF: 2 x 3" diaphragm compression 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 neutral 3D fabric
Rigging components
high grade steel with anti-corrosion coating
Finish
dark grey brown Pantone 426C
pure white RAL 9010
IP
1
IP45
Peak level at 1 m under free field conditions using 10 dB crest factor pink noise with specified preset.
K2/SB28 user manual (EN) version 4.0
24
Specifications
K2 dimensions
25
354 mm / 13.9 in
1338 mm / 52.7 in
286 mm / 11.3 in
400 mm / 15.8 in
K2/SB28 user manual (EN) version 4.0
Specifications
K1-SB specifications
Description
K1-SB system subwoofer 2 x15", amplified by LA8
Low frequency limit
1
35 Hz ([K1SB_X])
Maximum SPL
143 dB ([K1SB_X])
Transducers
LF: 2 x 15", 4" coil, magnesium-die basket, vented magnet design
Acoustical load
bass-reflex
Nominal impedance
LF: 4 Ω
Connectors
IN: 1 x 4-point speakON
Rigging 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
1
high grade steel with anti-corrosion coating
Peak level measured at 1 m under half space conditions using 10 dB crest factor pink noise with specified preset.
K1-SB dimensions
1342 mm / 52.8 in
K2/SB28 user manual (EN) version 4.0
438 mm / 17.1 in
520 mm / 20.5 in
505 mm / 19.9 in
26
Specifications
SB28 specifications
Description
high power subwoofer 2×18", amplified by LA8
Low frequency limit
1
25 Hz ([SB28_100])
Maximum SPL
140 dB ([SB28_100])
Transducers
LF: 2 × 18" neodymium, direct radiation
Acoustical load
bass-reflex
Nominal impedance
LF: 4 Ω
Connectors
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
1
aluminium
Peak level measured at 1 m under half space conditions using 10 dB crest factor pink noise with specified preset.
SB28 dimensions
550 mm / 21.7 in
700 mm / 27.6 in
1300 mm / 51.2 in
27
K2/SB28 user manual (EN) version 4.0
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