Dolby Laboratories Digital Loudspeaker Users Manual

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Dolby Lake Processor

The Dolby Lake Processor offers a visionary approach to controlling and optimizing any
loudspeaker system in any venue, while simultaneously improving the sound quality.
The Dolby® Lake® Processor marks the next generation in
digital loudspeaker control and equalization technology. With
unsurpassed audio quality and the most advanced loudspeaker
processing available, it will instantly improve the sound of
any system. Effortless control is provided through wireless
tablet software or the new, patent-pending, front-panel Portal
metering and control interface.
The basic platform offers complete, native-digital signalprocessing functionality, with support for up to four-in by
twelve-out for loudspeaker applications and eight-in by
eight-out for EQ applications. The signal processing can also
be changed to provide an EQ four-by-four together with a
loudspeaker two-by-six configuration.

The Lake Processor includes several advanced technologies
for improving sound quality. These include Raised Cosine
Equalization (the foundation underlying the revolutionary Ideal
Graphic EQ™ and Lake Mesa EQ interfaces), plus linear phase
crossovers, LimiterMax™ loudspeaker protection, and Iso-Float
Ground Isolation.
Four slots provide additional configurability, for adding analog
I/O and other capabilities via expansion cards. We offer the Lake
Processor in five preconfigured versions. Converter cards can
be easily added at any time, in the shop or in the field, to meet
changing needs.

Dolby Lake Processor Configurations, Rear-Panel Views
Shown here are the five factory configurations, and two expansion cards. The Lake Processor
can be easily upgraded or reconfigured to meet specific requirements.

Dolby Lake Processor LPD
The LPD provides the foundation of the Dolby Lake processing system, offering native
digital I/O in AES/EBU format. It also has a S/PDIF input and output for interfacing with
consumer devices. Four card slots can incorporate analog converters.

Dolby Lake Processor LP4D4
The entry-level analog- and digital-enabled Lake Processor, the LP4D4 is the nextgeneration Lake Mesa Quad EQ. It has two analog converter cards to provide four analog
inputs and four analog outputs for EQ-purposed signal processing.

Dolby Lake Processor LP8D8
The top-of-the-line for Lake Mesa EQ processing, the LP8D8 provides eight channels of
analog inputs and outputs. This fully configured processor offers the ultimate surroundsound loudspeaker management solution.

Dolby Lake Processor LP4D8
The LP4D8 fulfills our most frequent customer request—additional inputs and outputs. It
brings a four-by-eight configuration to Lake loudspeaker processing, and it is capable of
running four two-way crossovers for monitor applications.

Dolby Lake Processor LP4D12
The flagship Lake loudspeaker processor, the LP4D12 takes the next step, providing an
ultimate loudspeaker management system. The LP4D12 is capable of running up to four
three-way crossovers.

Upgrade Kits
We developed the Dolby Lake Processor for maximum field flexibility.
Currently, the following upgrade kits are available:
Quad D/A Converter Upgrade, KIT982
The Quad D/A Converter kit allows you to upgrade your Dolby Lake
Processor to include more analog output channels, or reconfigure
your analog I/O on an as-needed basis. As an example, multiple
Quad D/A kits can convert your digital-only processor into a digitalinput, twelve-analog-output unit.
Quad A/D Converter Upgrade, KIT983
The Quad A/D Converter kit allows you to upgrade your Dolby Lake
Processor to include more analog input channels, or reconfigure your
analog I/O on an as-needed basis. For example, this card can make
your four-by-eight loudspeaker processor into an eight-by-eight
Mesa EQ.

Dolby Lake Processor Operating Specifications

Front-Panel Interface

Displays
Four daylight readable custom LCD Portal displays,
3 × 10 user configurable character displays per
Portal, 2 × 104 circular meter segments per Portal,
16 mute and soft function buttons per Portal, arrow
keys and ME button for Portal control and parameter
adjustment

Audio Performance
Conversion Resolution
24-bit
Internal Sample Rate
96 kHz
Internal Data Path
32-bit floating point
System Propagation Delay
<2 ms from any input to any output (analog or digital)
Maximum Available Delay
2 s from any input to any output

Sample Rate Converters
Operating Sample Rates
44.1 kHz, 48 kHz, 88.1 kHz, 96 kHz
Resolution
24-bit
THD + Noise
0.00003% typical, 20 Hz to 20 kHz, unweighted
Dynamic Range
140 dB typical, 20 Hz to 20 kHz, unweighted

Back-Panel Interface
Analog I/O Connectors
XLR
AES/EBU I/O Connectors
DB-25, with selectable termination on pairs 1 and 2
S/PDIF I/O Connectors
Toslink™ optical
Word Clock Input
BNC with selectable termination
Ethernet
Auto 10/100, Auto Uplink: 2 RJ-45, 1 EtherCon™
Power
3-pin IEC, 2 fuses T 1.5A L, 5 × 20 mm

Ethernet
Auto 10/100, Auto Uplink: 1 RJ-45
Mute Enable Button
Enables muting of outputs and inputs via Portal mute
buttons

Digital-to-Analog Outputs
Frequency Response
+0/–0.1 dB, 3 Hz to 20 kHz
THD + Noise
0.00040% typical at 1 kHz
0.00056% typical, 20 Hz to 20 kHz, unweighted
Dynamic Range
113 dB typical, 20 Hz to 20 kHz, unweighted
Output Impedance
50Ω
Maximum Output Level
+21 dBu
Crosstalk
–100 dB, 2 Hz to 40 kHz

Analog-to-Digital Inputs
Frequency Response
+0/–0.2 dB, 2 Hz to 20 kHz
THD + Noise
0.00022% typical at 1 kHz, 0.00033% typical, 20 Hz
to 20 kHz, unweighted at +21 dBu headroom setting
Dynamic Range
116 dB typical, 20 Hz to 20 kHz, unweighted at
+21 dBu headroom setting
Input Impedance
20 kΩ balanced, 10 kΩ unbalanced
Maximum Input Level
+26 dBu
Input Sensitivity Settings for Digital Full-Scale
+10 dBu, +16 dBu, +21 dBu, +26 dBu
Common Mode Rejection
65 dB, 20 Hz to 20 kHz, 75 dB typical at 1 kHz,
70 dB typical at 20 kHz
Crosstalk
–100 dB, 2 Hz to 40 kHz

Combined A/D and D/A
THD + Noise
0.00050% typical at 1 kHz, 0.00063% typical,
20 Hz to 20 kHz, unweighted
Dynamic Range
113 dB typical, 20 Hz to 20 kHz, unweighted

Meter Button
Toggles through input and output meter displays
Menu Button
Provides a menu driven interface for full-function
front-panel control

AES/EBU I/O and S/PDIF I/O
Supported Resolutions
Up to 24-bit
Supported Sample Rates
44.1 kHz, 48 kHz, 88.1 kHz, 96 kHz

Power Requirements
100–240 VAC ±10%, 120 W maximum

Dimensions and Weight
2-RU rackmount: 8.74 × 48.26 × 35 cm
(3.44 × 19 × 13.78 inches); net: 9 kg (20 lb)

Regulatory Notices
North America: complies with limits for a Class A
digital device, per Part 15 of FCC rules, and Industry
Canada ICES-003 specifications. UL Listed for the US
and Canada. Europe: complies with requirements of
Low Voltage Directory 73/23/EEC and EMC Directive
89/336/EEC. Carries CE marking accordingly.

Warranty
One-year limited, parts and labor; see disclaimer.
Specifications subject to change without notice.
Disclaimer of Warranties
Equipment manufactured by Dolby Laboratories is warranted
against defects in materials and workmanship for a period of one
year from the date of purchase. There are no other express and
implied warranties and no warranty of merchantability or fitness
for a particular purpose, or of noninfringement of third-party rights
(including, but not limited to, copyright and patent rights).
Limitation of Liability
It is understood and agreed that Dolby Laboratories’ liability,
whether in contract, in tort, under any warranty, in negligence, or
otherwise, shall not exceed the cost of repair or replacement of the
defective components or accused infringing devices, and under
no circumstances shall Dolby Laboratories be liable for incidental,
special, direct, indirect, or consequential damages (including, but
not limited to, damage to software or recorded audio or visual
material), cost of defense, or loss of use, revenue, or profit, even
if Dolby Laboratories or its agents have been advised, orally or in
writing, of the possibility of such damages.
Dolby and the double-D symbol are registered trademarks of Dolby
Laboratories. All other trademarks remain the property of their respective owners. © 2008 Dolby Laboratories, Inc. All rights reserved.
S08/16957/19498

Dolby Laboratories, Inc.  100 Potrero Avenue, San Francisco, CA  94103-4813  T 415-558-0200  F 415-863-1373
233 Castlereagh Street, 16th Floor, Sydney, NSW 2000  Australia T 61-2-9101-7900  F 61-2-9101-7800  dolby.com/livesound



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