Lake LM 44 User manual

The global standard
for digital processing in live sound
Two decades, three continents , one goal
In the early 1990’s, three Australian engineers – David
McGrath, Brian Connolly and Marcus Altman – formed
a new enterprise to develop advanced digital signal
processing applications. The Lake name was inspired
by a modest pond near their ofces in Adelaide. Lake
quickly expanded, and following relocation to Sydney,
soon developed the Huron Digital Audio Workstation. The
DSP architecture of Huron contains advanced proprietary
algorithms that were adapted for sound reinforcement
applications in future generations of products.
In the mid-1990s, the late, great Bruce Jackson –
renowned technical innovator and tour sound engineer
(Elvis Presley, Bruce Springsteen, Barbra Streisand)
– joined with Lake’s David McGrath to develop a new
digital processor for sound reinforcement applications.
They set up shop in Santa Monica, California. Renowned
tour sound company Clair Brothers, headquartered in
Lititz, Pennsylvania decided to back development of the
promising new technologies. Clair Technologies LLC
was formed in 1997 by Clair, Jackson, McGrath and
Ed Meitner to produce the new live sound processors,
initially built exclusively for Clair.
In 2001, Lake re-acquired the technologies, made further
renements, and introduced them to the wider industry
as Lake Contour Pro 26™.
In the history of live sound reinforcement, few products stirred as much industry excitement as did the original Lake
Processors when they were rst introduced more than a decade ago. Simply put, both the core digital processing
technology and the graphical user interface represented a quantum leap beyond other systems available at the time.
Today, the legacy continues, with Lake Processing incorporated into Lab.gruppen PLM Series Powered Loudspeaker
Management Systems as well as two LM Series stand-alone Lake processors.
Adelaide
Sydney
San Francisco
Santa Monica
The distinctive front panel of the
Dolby Lake Processor
Clair iO team (L to R): Bruce
Jackson, David McGrath, Marcus
Altman, Stewart Bartlett
Kungsbacka
Lititz, PA
Dolby Laboratories (San Francisco, CA) acquired
Lake Technologies in 2004. Backed by the company’s
worldwide resources, the Dolby Lake Processor was
soon established as the premier DSP platform across the
full range of live sound applications.
In 2006, Dolby and Lab.gruppen announced an
agreement to incorporate Lake processing into the
forthcoming PLM Series of Powered Loudspeaker
Management systems. The rst Lab.gruppen product
to incorporate Lake processing, the PLM 10000Q, was
introduced in 2007.
Early in 2009, Dolby decided to exit the commercial live
sound market. Lab.gruppen of Sweden acquired both
the Lake trademarks and exclusive rights for use of Dolby
Lake Processor technology for the touring and permanent
sound reinforcement markets. Both divisions are now
headquartered in Kungsbacka, where intensive research
and development efforts have produced renements
to Lake Processing as implemented in the PLM Series
as well as two new products, the LM 26 Digital Audio
Loudspeaker Processor and more recently the LM 44
Digital Audio System Processor.
Today,
the pairing of Lab.gruppen amplier platforms
with Lake Processing opens new pathways for the
development of completely integrated systems for
powering loudspeakers. At the same time, Lake is
committed to continued development of stand-alone
products that can be seamlessly integrated into any
sound reinforcement system.
2 32

Lake LM Series digital audio processors offer an
unprecedented combination of core processing
power, user-friendly control interfaces, and multi-format
connectivity. Exclusive LM Series features include
proprietary filter algorithms for Lake Mesa and Contour
modules along with standard I/O connectivity on analog,
AES3 digital and Dante network with programmable
automatic failover.
Singular performance, two configurations
The Lake LM Series comprises two models, the
LM 26 and the LM 44. Other than their different analog
and AES3 input/output configurations, both models
are essentially identical in performance and features.
Both can accommodate either Lake Contour modules
for crossover and delay functions, or Lake Mesa EQ
for the industry’s most precise, flexible and sonically
impeccable equalization functions. Also, both incorporate
proprietary Lake processing algorithms for Raised Cosine
Equalization™, LimiterMax™ peak and RMS limiters, and
linear phase and classic crossovers. Maximum available
delay is two seconds.
The LM Series’ easily programmable EQ and delay
capabilities allow quick reconfiguration for use with
either self-powered loudspeaker applications or in multi-
way systems using separate power amplifiers. Audio
performance is impeccable in every respect, with 24-bit
AD/DA conversion, 96 kHz internal sampling frequency
and a 32-bit internal data path. And a universal power
supply with detachable locking mains cable allows
worldwide use LM Series processors provide seamless
compatibility with Lab.gruppen PLM Series Powered
Loudspeaker Management Systems as well as Dolby®
Lake Processors and all legacy Lake processors, with
accessible simultaneously from the same Lake Controller
Windows-based user interface.
All connected, all the time
LM Series processors are the only products of their kind
to offer – as standard – analog, AES digital and dual
redundant Dante networked connectivity. There are no
separate versions, requiring choice of analog or digital,
and no extra-cost optional cards to order. With all three
connectivity types fully integrated into the core design,
LM Series processors can easily function as a Dante
break-in/break-out unit while also offering a programmable
failover feature and extensive signal mixing and
matrixing facilities.
LM Series units also include a 9-pin General Purpose
Input/Output (GPIO), configurable via the front panel
or Lake Controller. GPIO facilitates external triggering
of mute, power control and preset functions as well as
reporting of fault and status conditions.
Hardware stacking/linking and
software cross-configuration
Both LM Series processors support stacking/linking of
multiple units that enables them to function as a single
processor with expanded I/O, for example a 4 × 12 analog
I/O configuration (2 x LM 26) or an 8 × 8 I/O configuration
(2 x LM 44). Both models can be combined to offer further
flexibility. Essentially, this enables users to duplicate
functions of now-discontinued Dolby Lake Processors
with the same analog I/O configurations – although now
enhanced with greater flexibility and redundancy thanks
to upgraded Dante connectivity. I/O interconnections
between stacked/linked units can be realized using either
spare AES or Dante channels.
Front panel interface
The front panel interface includes dedicated input
and output metering for each processing channel,
plus dedicated mute buttons (with integral LED status
indication) for each processing channel. Parameters
are easily adjustable using soft keys and a rotary
encoder. The daylight-readable display switches
functions for comprehensive metering or to facilitate
signal routing or parameter adjustment.
LM Series processors:
Power and flexibility for any application
The powerful LM 44 provides Mesa EQ filters and Linear phase crossovers with AES3 connectivity, 4 x 4 analog I/O
with Iso-Float and Dante digital audio.
4 5

Precision control at your fingertips
LM 26 and LM 44
Digital audio loudspeaker and system processors
Lake Controller software suite
The Lake Controller and associated applications,
including Firmware Update and Preset Manger
Utilities, form a powerful suite of software enabling
detailed control and management of Lake processor
networks. The Lake Controller enables Windows
PC-based adjustment of all Lake Processing parameters,
including gain, delay, limiters, EQ, crossovers and
all I/O configuration and routing. Using a wireless
touch-screen Tablet PC, the Lake Controller can be
used to group processors together for simultaneous
control from any location in the venue. The included
Lake Analyzer Bridge provides a real-time interface
with Smaart Live and Live Capture Light/Pro, providing
direct audio analysis and measurement feedback within
the Lake Controller.
One controller for all, with iPad option
The LM Series integrates into the Lake Controller
software alongside PLM Series devices, Dolby Lake
Processors, and all other legacy Lake devices. New
Lake Controller functionality provides LM Series-specific
routing features, GPIO configuration and combined PLM
and LM Series global power control and event log. In
addition, Lake Controller functionality is now available
on the iPad using a VNC remote desktop solution.
The LM 26 provides a two input/six output analog
configuration that is ideally suited for multi-way
loudspeaker crossover, delay and EQ functions.
The LM 26 also provides 4 × 8 AES3 digital I/O and
4 × 8 Dante networked I/O, all with comprehensive
signal routing to provide Dante break-in / break-out
and failover functionality. Two LM 26 units may be
stacked and linked to function seamlessly as a single
4 × 12 processor.
LM 26 applications include:
• Crossover, delay and EQ for multi-way
loudspeaker systems
• Line driver and system EQ for self-powered
loudspeaker systems
• Dantebreak-in/break-out
• TransmissionsystemtoandfromFOH andstage
L /stage R
The LM 44 provides a four input/four output analog
configuration that is suited for a variety of system
signal processing and routing applications. The
LM 44 also provides 8 × 8 AES3 digital I/O and
4 × 8 Dante networked I/O, all with comprehensive
signal routing to provide Dante break-in / break-out
and failover functionality. Two LM 44 units may be
stacked and linked to function seamlessly as a single
8 × 8 processor.
LM 44 applications include:
• Mix-matrixandsystemEQ betweenFOHconsole
and loudspeaker system
• Line driver and system EQ for self-powered
loudspeaker systems
• InsertedEQformonitorsystems
• Dantebreak-in/break-out
• Transmissionsystemto andfrom FOH andstage
L /stage R
LM Series in Mesa EQ mode; Contour crossover mode also available.
Lake is a nationa l and/or international registered trademark of L ab.gruppen AB. PLM and Powered Loudspeaker Ma nagement are trademarks of Lab.gruppen A B. Dante and Zen are trademarks of
Audina te Pty Ltd. Dolby is a registered trademark of Dolby Laboratories. Raised Cosine Equalization, Iso- Float, Contour Pro 26, Mesa Quad EQ, and LimiterMax are tradem arks of D olby Laboratories.
All other trademarks remain the property of their resp ective owners. Copyright © 2011 Lab.gruppe n AB. All r ights reser ved.
Input
Mixer A
Module Input Section
Pass-thru from Input Router to Output Router
EQGain Delay HPF/LPF LimiterMax
RMS/Peak
Gain / Delay
Polarity / Mute
Module Output Section
Analog 1,2
AES 1,2,3,4
Dante 1,2,3,4
EQ
Gain Delay HPF/LPF LimiterMax
RMS/Peak
Gain / Delay
Polarity / Mute
EQ
Gain Delay HPF/LPF LimiterMax
RMS/Peak
Gain / Delay
Polarity / Mute
EQGain Delay HPF/LPF LimiterMax
RMS/Peak
Gain / Delay
Polarity / Mute
Input
Mixer B
Input
Mixer C
Input
Mixer D
LM 26 - INPUTS
Analog 1,2,3,4
AES 1,2,3,4,5,6,7,8
Dante 1,2,3,4
LM 44 - INPUTS
Analog 1,2
AES 1,2,3,4
LM 26 - INPUTS
Analog 1,2,3,4
AES 1,2,3,4,5,6,7,8
LM 44 - INPUTS
Analog 1,2,3,4,5,6
AES 1,2,3,4,5,6,7,8
Dante 1,2,3,4,5,6,7,8
LM 26 - OUTPUTS
Analog 1,2,3,4
AES 1,2,3,4,5,6,7,8
Dante 1,2,3,4,5,6,7,8
LM 44 - OUTPUTS
Output Routing
Input
Routers
1-8
WITH
INPUT
MUTES
6 7

Item no. LAKE FLC-2011
LAKE ▸SWEDEN
INTERNATIONAL CONTACT ▸ [e-mail]
NORTH & SOUTH AMERICA CONTACT ▸ [e-mail]
www.lakeprocessing.com

TECHNICAL SPECIFICATIONS
DIGITAL AUDIO
LOUDSPEAKER PROCESSOR
LM 44
DIGITAL AUDIO
SYSTEM PROCESSOR
LM 26

Specifications LM 26
2-in/6-out or 4-in/4-out digital audio processor
2 Contour Modules or 4 Mesa Modules
Raised Cosine Mesa and Ideal Graphic input equalizers
Linear phase and classic crossovers and output EQ
LimiterMax peak and RMS limiter
Delay, mute, phase, gain
Audio Performance
Internal sample rate 96 kHz
A/D and D/A conversion resolution 24 bit
Internal data path 32 bit floating point
Product propagation delay, best case (96 kHz AES to 96 kHz AES) 0.872 ms
Product propagation delay, analog (Analog in to Analog out) 1.036 ms
Maximum available delay 2 seconds
Analog
Inputs and Outputs 2 inputs, 6 outputs
Dynamic range, inputs 116 dB
Dynamic range, outputs 115 dB
Frequency response, analog to digital +/-0.1 dB, 20 Hz to 20 kHz
Frequency response, digital to analog +/-0.03 dB, 20 Hz to 20 kHz
THD + Noise, inputs 0.00024% at 1 kHz
THD + Noise, outputs 0.00037% at 1 kHz
Iso-Float ground isolation Yes, separate setting for input and output
Input sensitivity settings 12 or 26 dBu
Maximum output level 21 dBu
Input impedance 20 kOhm balanced, 10 kOhm unbalanced
Common Mode Rejection (CMR) >74 dB, 20 Hz to 20 kHz
Crosstalk -98 dB, 20 Hz to 20 kHz
AES3
Inputs and Outputs 4 inputs, 8 outputs
Supported resolutions Up to 24 bit
Supported sample rates 44.1, 48, 88.2, 96, 176.4, 192 kHz
Termination Selectable
Dante Audio Network
Inputs and Outputs 4 inputs, 8 outputs
Supported sample rates 48, 96 kHz
Supports redundant paths Yes
Flexible topology Yes
Network latency 0.5, 0.8, 1.3, 4 ms
Front Panel User Interface
Display Daylight readable monochrome
Meters LED meters and clip indicators per channel
Mute access Mute button and LED indication per channel
LED Fault and Warning indication Yes
Parameter adjustment Rotary encoder
Standby Power button On/Standby
Back Panel Interface
Analog inputs and outputs 2 + 6 XLR
AES inputs and outputs DB-25
Ethernet Dual Neutrik etherCON
GPIO DB-9
Power Locking 3-pin IEC
Control and monitoring interface Via Ethernet for Lake Controller software
Ethernet
Gigabit Ethernet 1000 Base-T
Fast Ethernet 10 0 Base -Tx
GPIO
Inputs 2 General Purpose Inputs (GPI) supporting external contact closure
Outputs 2 General Purpose Outputs (GPO) with internal contact closure
Software configurable input control Standby state, Mute state, Dual Preset recall
Software configurable output indication Standby state, Mute state, Faults, Ready
Device Presets
Frame presets 100
Power
Nominal voltage 100-240 VAC
Operating voltage 70 -265 VAC
Power consumption 30 W maximum
Dimensions W: 483 mm (19”), H: 44 mm (1 U), Overall D: 290 mm (11.5”)
Weight 5 kg (11 lbs.)
Finish Black painted steel chassis with aluminum handles
Approvals CE, ANSI/UL 60065 (ETL), CSA C22.2 NO. 60065, FCC
Specifications subject to change without notice

Lake features
Module confi guration 2 Contour or 4 Mesa modules
Processing channels 6 in Contour mode, 4 in Mesa mode
Input routers 8 input routers with 4 priorities in each, seamless failover to lower priorities
Module Input mixer 4 ch. for Contour, 8 ch. for Mesa-modules. Mix any ratio between all input routers.
Input processing Parameteric EQ with Mesa and Ideal Graphic equalizers, both utilizing Raised Cosine algorithms
Output processing Linear phase or Classic crossovers, Parametric EQ, shelving and all-pass fi lters
Features Delay, Mute, Phase, Gain etc.
Limiters LimiterMax with Peak and RMS limiter. Confi gurable MaxRMSLevel, MaxRMSCorner, MaxRMSAttack,
MaxRMSRelease and MaxPeakLevel
SuperModule compatible Yes
Audio Performance
Conversion resolution 24-bit
Internal sample rate 96 kHz
Internal data path 32-bit fl oating point
Product propagation delay Best case (AES synchronous 96 kHz to AES synchronous 96 kHz via module) 0.871 ms
Analog (Analog in to Analog out via module) 1.049 ms
Pass thru (Analog in to AES synchronous 96 kHz bypassing module) 0.158 ms
Maximum available user delay 2 seconds
Analog
Inputs and Outputs 4 inputs, 4 outputs
Frequency Response, analog-to-digital +/-0.1 dB, 20 Hz to 20 kHz
Frequency Response, digital-to-analog +/-0.1 dB, 20 Hz to 20 kHz
THD+Noise, Inputs 0.00024% typical at 1 kHz
THD+Noise, Outputs 0.00037% typical at 1 kHz
Dynamic Range, Inputs 116 dB
Dynamic Range, Outputs 115 dB
Input Impedance 20 kOhm balanced, 10 kOhm unbalanced
Output Impedance 50 ohm
Maximum Input level +26 dBu
Input Sensitivity - settings for digital full-scale +12 dBu, +26 dBu
Maximum Output level +21 dBu
Crosstalk, Inputs -98 dB, 20 Hz to 20 kHz
Crosstalk, Outputs -98 dB, 20 Hz to 20 kHz
Common Mode Rejection Ratio (CMRR) >70 dB, 20 Hz to 20 kHz
AES3/EBU (sample rate converters available as desired)
Inputs and Outputs 8 inputs, 8 outputs
Supported sample rates 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz (I/O individually selectable)
Supported resolutions Up to 24-bit
THD+Noise 0.00002 % at 96 kHz and 0.00006 % at 44.1 kHz sample rate
Dynamic Range Base48 -140 dBFS, Base44 -125 dBFS
Clocking
Clock selection Manual or automatic according to priority scheme
Oscillator type / Synchronization High quality VCXO clock can provide Dante master clock or slave. Automatic synchronization with Dante network.
Base48 2 (Primary and SRC)
Base44 1 (SRC)
Clock accuracy < ± 7 ppm
Dante (Audio Network)
Inputs and Outputs 4 inputs, 8 outputs
Supported sample rates 48 kHz, 96 kHz
Support redundant paths Glitch-free Dual Redundant Dante using two Ethernet networks
Receiver latency 0.5 ms, 0.8 ms, 1.3 ms, 4 ms
GPIO
Inputs 2 General Purpose Inputs (GPI) supporting external contact closure
Outputs 2 General Purpose Outputs (GPO) with internal contact closure
Software confi gurable input control Standby state, Mute state, Dual preset recall
Software confi gurable output indication Standby state, Mute state, Faults, Ready
Device presets
Frame presets 100
Power requirements
Nominal Voltage 100-240 VAC
Operating Voltage 70-265 VAC
Power consumption 30 W maximum
Front panel interface
Display Daylight readable monochrome (128 x 64)
Meters LED for signal level and clip indicators per channel
Mute access Dedicated Mute button and LED indication per processing channel
Menu Intuitive and powerful user interface with soft keys
Status indication LED Fault and Warning indication and detailed description on display
Parameter Adjustment Single/multiple parameter edits with rotary encoder
Back Panel Interface
Analog Inputs and Outputs 4 + 4 XLR
AES Inputs and Outputs DB-25, with selectable termination
Ethernet Auto 100/1000, Auto uplink, 2 x Neutrik etherCON RJ45 connectors
GPIO DB-9
Power Detachable locking 3-pin IEC
Control and monitoring interface Via Ethernet for Lake Controller software, or DLM (the 3rd party protocol)
Dimensions (W/H/D) 483 mm (19"), 44 mm (1 U), 290 mm (11.5")
Weight 5 Kg (11 lbs.)
Finish Black painted steel chassis with cast alumimum handles
Approvals CE, ANSI/UL 60065 (ETL), CSA C22.2 NO. 60065, FCC
Warranty 3 years, components and factory workmanship; see full warranty statement
Specifications subject to change without notice
Specifications LM 44
Specifications LM 44

Lake is a national and/or international registered trademark of Lab.gruppen AB.
Dante and Zen are trademarks of Audinate Pty Ltd. Dolby is a registered trademark of Dolby Laboratories.
Raised Cosine Equalization, Iso-Float, Contour Pro 26, Mesa Quad EQ, and LimiterMax are trademarks of Dolby Laboratories.
All other trademarks remain the property of their respective owners. Copyright © 2011 Lab.gruppen AB. All rights reserved.
LAKE PROCESSING ▸SwEdEN
INtERNAtIONAL CONtACt ▸ [e-mail]
NORth & SOuth AmERICA CONtACt ▸ [e-mail]
www.lakeprocessing.com