Problems And Support .......................................................................................................... 163
Index .................................................................................................................................... 164
7
INTRODUCTION
Congratulations and thank-you for the purchase of this Genelec DSP Loudspeaker System. These
systems are designed to integrate easily into the digital production environment. There are several ways
to configure and operate the DSP loudspeakers for a wide variety of high quality audio applications. The
two-way loudspeakers have also analog inputs, making them versatile and intelligent replacements for
analog loudspeakers.
This manual addresses the Genelec Loudspeaker Manager GLM™ and the proprietary Genelec
loudspeaker control network, guiding step-by-step through the setup process. The DSP loudspeakers
can also be used in stand-alone mode just like any other loudspeaker but without enjoying the benefits of
additional flexibility and versatility of the GLM™.
Genelec Loudspeaker Manager (GLM), Genelec AutoCal, AccuSmooth, SinglePoint, Symmetrical
Placement EQ, AutoPhase and MultiPoint are trademarks of Genelec Oy.
Genelec Time Data file containing the computed impulse
responses of a loudspeaker or subwoofer.
A 3.5 mm stereo jack-to-jack interconnection cable used to
connect the MIC OUT socket on the GLM Network Interface to a
computer’s soundcard input.
A proprietary smoothing algorithm that has a higher resolution
(narrower smoothing bandwidth) at low frequencies than a
standard 1/3 octave smoothing, and a similar resolution at
high frequencies. This is used by AutoCal to ensure accurate
placement of notch filters at critical bass frequencies.
A page in the GLM that provides access to the Acoustical Settings
in the loudspeaker or subwoofer. The Interactive Response
Editor can also be accessed here.
A self-guided Wizard that allows for manual or automated
(AutoCal) calibration of the Loudspeaker Acoustic parameters.
The GLM supports AES/EBU digital audio cables and analog
audio cables. An analog audio cable carries one channel of
audio. An AES/EBU cable can carry one or two channels of
audio.
Although the definition of an audio channel is rather straightforward
and clear, it should not be confused with loudspeakers or audio
cables in the loudspeaker system. The AES/EBU digital audio
cables may carry one or two audio channels. There may be one
or more loudspeakers reproducing one audio channel.
Bass Management is used to reproduce the low frequency
content of audio channels over one or more subwoofers instead
of loudspeakers. This can be the low frequency content from
the full-bandwidth audio channels. Parts or the entire LFE audio
channel can also be bass managed.
The digital signal cable carries an AES/EBU audio signal. The
GLM supports AES/EBU digital audio cables and analog audio
cables. An AES/EBU cable can carry one or two channels of
audio.
9
Digital Thru
Genelec 8200A Calibration
Microphone
Genelec AutoCal
Genelec AutoPhase
GLM Control Network
GLM DSP Loudspeaker Manager
Package
GLM DSP Multiroom Expansion
Package
GLM Main Page
GLM Network Interface
GLM System Setup Editor
The connector on the back of a loudspeaker used to pass the
AES/EBU digital audio signal presented to the digital input
connector onto another loudspeaker.
A factory calibrated acoustic measurement microphone used for
AutoCal system alignment.
Genelec AutoCal is a property of the GLM software that
utilizes built-in test signal generators inside all Genelec DSP
loudspeakers to acoustically measure and align the loudspeaker
system.
Genelec AutoPhase is a part of Genelec AutoCal. It aligns the
phase of the subwoofer(s) in the system to the designated
loudspeaker(s).
The GLM loudspeaker control network is a proprietary network
allowing the setting, reading and monitoring of loudspeakers and
subwoofers on the GLM network. System setup can be achieved
very rapidly by simply opening a System Setup file, which
causes all system and loudspeaker settings to be automatically
communicated to all loudspeakers.
The GLM control network delivery package containing all
hardware and software to build a GLM Loudspeaker Manager
environment. Loudspeakers and subwoofers are purchased
separately.
An expansion package providing a license and hardware to
install the GLM in multiple rooms within a single facility.
The face of the GLM. This page is used to access all other
functions of Loudspeaker Manager.
The GLM Network Interface is a USB device that connects
the computer to the GLM loudspeaker control network.
The GLM Network Interface translates communication between
the computer and the control network, enabling a very large
and physically long control network with multiple loudspeakers.
The GLM Network Interface isolates the private and confidential
messaging with loudspeakers from any public data networks and
from the functioning of the computer running the GLM software.
This page is used to access more detailed sections of the GLM
including the Acoustical Settings Editor.
10
GLM Software
Group
ID Tone
IEC Mains Cable
Interactive Response Editor
Loudspeaker
Manual Acoustic Wizard
Manual Cabling Wizard
Manual Controls
Microphone Holder
MultiPoint
Network Cable
Network Control Mode
Node
GLM is an abbreviation for the Genelec Loudspeaker Manager.
This software enables setup and control of loudspeakers on the
GLM control network through the use of system setup files, and
supports fully automated loudspeaker system setup.
Loudspeakers or audio channels designated to play
simultaneously.
A built-in tone in the DSP loudspeakers and subwoofers used to
identify which loudspeaker is being communicated to.
A standard detachable mains cable used to apply mains electrical
power to the loudspeaker or subwoofer.
Located in the Acoustical Settings Editor, this Editor allows for
the interactive adjustment of a measured response using the
Room Response Controls.
This term is used for loudspeakers that are not subwoofers. A
8240A or 8250A two-way active DSP loudspeaker.
A self-guided Wizard that allows for manual calibration of the
loudspeaker acoustic parameters.
A self-guided Wizard that allows for more complicated and
versatile System Setups not found in the Rapid Cabling Wizard.
The user interface settings on a loudspeaker or subwoofer used
when in stand-alone mode.
The rubber mounting hardware to attach the Genelec 8200A
Calibration Microphone to a standard microphone stand.
A method of spatial averaging used in AutoCal measurements,
used when optimizing the Acoustical Settings.
A CAT5 cable with RJ45 connectors (type PC-to-HUB, straight
not crossed wiring). This cable is also used as an Ethernet
network cable. Network cables connects the GLM Network
Interface to the loudspeakers and subwoofers to form a network
of devices that may be controlled using the GLM software
The use of Genelec DSP loudspeakers with the GLM software
and the control network.
Every loudspeaker and the GLM Network Interface is a node on
the GLM control network.
11
Rapid Cabling Wizard
Room Response Controls
SinglePoint
Software CD
Stand-Alone Mode
Stored Settings
Subwoofer
System Setup File
System Setup Wizard
Third-party Volume Controller
USB Cable
The GLM contains pre-made system setups of the most typical
loudspeaker arrangements. Rapid Cabling makes system setup
simple and fast by allows the selection of one of these presets.
A collection of controls used to modify the loudspeaker or
subwoofer response in order to improve the in-room sound
quality at the listening position.
A measurement taken in the main monitoring position used by
AutoCal when optimizing the Acoustical Settings.
The CD-ROM containing the install files for Genelec Loudspeaker
Manager and AutoCal.
The use of Genelec DSP loudspeakers as individual loudspeakers, without the GLM software and the control network.
The settings stored inside a loudspeaker or subwoofer. These
settings are used when the loudspeaker is operated in the stand
alone mode
A 7260A, 7270A or 7271A active DSP subwoofer with 8 channel
bass management.
Files stored on the hard drive of a computer running the GLM.
Loading a System Setup File in GLM automatically sets up
all loudspeakers in the system with stored monitoring Group
definitions, audio cable definitions, defaults for monitoring levels
and all acoustical alignment settings.
System Setup Wizard guides the user through the process of
setting up the GLM.
A peripheral device (e.g. Griffin PowerMate) used to control the
system volume.
A type A-B USB cable used to connect the GLM Network
Interface to a computer.
12
SYSTEM PARTS
The Genelec DSP loudspeaker system consists of
• Two-way loudspeakers
• Subwoofers
• GLM DSP Loudspeaker Manager Package containing the user interface software with
the GLM Control Network Interface and a factory calibrated acoustic measurement microphone for
controlling DSP loudspeakers
• GLM DSP Multiroom Expansion Package
A basic working system requires only loudspeaker(s). See Getting Started.
The GLM™ Genelec Loudspeaker Manager is a loudspeaker control networking system that offers
capability to control all system parameters as well as the possibility for detailed acoustical alignment
of every loudspeaker in the system. The use of the GLM is warmly recommended. Genelec AutoCal™
provides the GLM with a fully automated multi-loudspeaker system acoustical calibration capability and
comes with a factory-calibrated measurement grade microphone, microphone amplifier and microphone
holder.
Contents of the GLM delivery box
• Software CD
• Genelec DSP Loudspeaker System Operating Manual
• Quick Connection Guide
• GLM
•
• Genelec 8200A Measurement Microphone
• Microphone Holder
• Measurement Signal Cable with 3.5 mm stereo plugs
Network Interface with a built-in calibration microphone amplifier
The GLM software is sold with a site-license permitting installation into multiple rooms. The GLM DSP
Multiroom Expansion Package delivers a GLM Network Interface and cables for installation into one
additional room. Each additional room needs a multiroom expansion pack.
• GLM
•
• Network Cable
Network Interface
USB Cable
14
LOUDSPEAKERS
This section provides a rapid overview of Genelec DSP loudspeakers. In-depth information about the
DSP loudspeakers is available at www.genelec.com and in the Operating Manuals supplied with the DSP
loudspeakers.
Two-Way Loudspeakers (8200 Series)
The two-way DSP loudspeakers accept both AES/EBU digital audio and analog audio.
Analog input
The analog input on Genelec loudspeakers has a fixed sensitivity. A 0 dBu (0.775 volts) signal produces
a 94 dB SPL at 1 m. The maximum sound pressure level depends on the loudspeaker model. A larger
loudspeaker will produce a higher maximum sound pressure level than a smaller one.
Digital audio input
The digital input has a fixed sensitivity. Digital signals are represented relative to their maximum value, or
Full Scale (FS) value. For example, -10 dBFS means that the digital audio signal level is 10 dB below the
full scale or the maximum representable digital signal.
In Genelec DSP loudspeakers, the maximum theoretical audio level for a 0 dBFS digital audio input
signal translates to 130 dB SPL at 1 m sound pressure level. For example, a signal having -36 dBFS level
produces a sound level of 94 dB SPL at 1 m. This is a technical specification of the loudspeaker, and the
Genelec Loudspeaker Manager GLM can adjust the monitoring volume down from this level.
Digital audio sample rate can vary from 32 kHz to 192 kHz and word length from 16 to 24 bits. Single-Wire
and Dual-Wire signals are automatically detected
Digital audio takes precedence over analog audio. If a valid AES/EBU signal is presented to the
loudspeaker, that input will be selected and the analog audio will mute. Note that there may be a valid
AES/EBU signal although the signal is silent.
15
Two-Way Loudspeaker Functional Blocks
All audio enters the DSP processor, where all signal processing and filtering takes place. The audio
outputs go via digital-to-analog conversion to built-in power amplifiers and on to the tweeter and woofer
drivers. The loudspeakers have built-in user interfaces with switches and a rotary level control in the rear
of the loudspeaker, as well as a connection for the Genelec Loudspeaker Manager network enabling
centralized management of up to 30 loudspeakers in one installation.
Subwoofers (7200 Series)
Digital audio input
The digital input has a fixed sensitivity. Digital signals are represented relative to their maximum or Full
Scale value. For example, -10 dBFS means that the signal level is 10 dB below the full scale or the
maximum representable digital signal.
In Genelec DSP subwoofers, the maximum audio level of 0 dBFS translates to the theoretical 130 dB SPL
at 1 m sound pressure level. For example, a -36 dBFS signal produces a sound level of 94 dB SPL at 1
m. Genelec Loudspeaker Manager GLM adjusts the monitoring volume down from this level.
16
Digital audio sample rates can vary from 32 kHz to 192 kHz and word length from 16 to 24 bits. SingleWire and Dual-Wire signals are automatically detected. Note that there may be a valid AES/EBU signal
although the signal is silent.
Subwoofer functional blocks
The subwoofers have AES/EBU digital audio inputs only. There are no analog audio inputs. All audio
enters the DSP processor, where all signal processing takes place. The output goes via digital-to-analog
conversion to the built-in power amplifier and driver(s). The subwoofers have a built-in user interface with
switches and rotary controls and a connection to the Genelec Loudspeaker Manager network enabling
centralized management of up to 30 loudspeakers including subwoofers in one installation.
17
GETTING STARTED
Quick course to system basics
Control network and audio cabling are separate. The first observation to be made is that audio signals
and control information travel along different cables. This has the inherent advantage of allowing one to
operate the system with the control network (known as the network control mode) or without the control
network if so desired (known as the stand-alone mode).
When using the Genelec loudspeaker control network, full control to all features in a loudspeaker become
available. Attaching the control network automatically puts the loudspeaker in the network-controlled
mode.
Digital audio. All Genelec DSP loudspeakers and subwoofers have AES/EBU digital audio inputs. When
applicable, run the AES/EBU audio cable(s) to the subwoofer first, then onto the main loudspeakers. If
the AES/EBU cable carries two digital audio channels, run another cable from the “Thru” output of the
loudspeaker to the input of the next loudspeaker.
18
If the audio source has a volume control for the AES/EBU digital audio, it can be used to control the
monitoring level.
If the AES/EBU outputs are fixed level line-outs, various volume controls options are available in the GLM
loudspeaker control software.
The GLM software provides several volume control faders on the computer display. These volume controls
can be used in the same computer running audio processing or recording software.
Third-party volume control knobs (for example Griffin PowerMate) that attach to a USB interface can also
be used to control the monitoring level through the GLM software and the Genelec loudspeaker control
network.
Analog audio. The two-way loudspeakers have an analog audio input and can be connected just like any
other (analog) loudspeaker. They can be used with analog subwoofers and mixed with analog two-way
loudspeakers to build a system. It is easy to achieve good system integration as the input sensitivity of
the DSP loudspeakers is the same as that of the analog loudspeakers.
19
Cabling works just like any other analog loudspeaker setup. The analog audio cables are first connected
to a Genelec subwoofer where bass management takes place, and then onwards to the two-way
loudspeakers.
Stand-alone mode refers to using DSP loudspeakers without the GLM Control Network.
Two-way DSP loudspeakers are equipped with both analog and digital inputs, and digital audio takes
precedence over analog audio. In stand-alone mode the analog input works only if there is no AES/EBU
digital audio input to the loudspeaker, for example when the digital cable is removed or the AES/EBU bit
stream is halted at the source.
When using the GLM loudspeaker system control software, it is possible to select between analog and
digital inputs. Analog and digital signals are never mixed.
When calibrating the DSP two-way loudspeakers one can select to use the same switch-based acoustic
alignments that can be found on the analog loudspeakers, or to use a much more versatile set of room
response controls available through the GLM loudspeaker control software and the Genelec loudspeaker
control network link built into all DSP loudspeakers.
20
The GLM software runs on any Windows XP or Macintosh OSX computer. The GLM Network Interface
connects the computer to the loudspeakers. Using the GLM software provides full access to all room
response controls. After aligning the loudspeakers acoustically, it is possible to store these settings inside
the loudspeaker’s memory.
Step-by-step system setup for GLM Control Network use
The Genelec DSP loudspeaker family uses a networking concept for controlling a system of loudspeakers.
A control network cable is provided with all Genelec DSP loudspeaker products.
To setup quickly, follow the steps detailed below. For further information consult the sections of this
manual mentioned in each step.
• Unpack and position the loudspeakers. See the “Loudspeaker Placement” section for details.
• Find the Genelec Control Network cables in each loudspeaker delivery box. Connect the control
network. See the “Genelec control network cabling” section for details.
• Find the GLM
Interface Device” section for details.
• Launch GLM, then follow the on-screen instructions to complete a System Setup. Select either
Rapid Cabling Mode or Manual Cabling Mode and follow the instructions.
• Select the appropriate Rapid Cabling preset in the GLM and launch the Rapid Cabling Wizard.
See the “Rapid Audio Cabling” section for details.
• To acoustically align the system, run the Acoustic Setup Wizard in the GLM. See the “Acoustic
Setup Wizard” section for details.
• Congratulations! Setup is now complete!
Network Interface and follow cabling instructions. See the “GLM Network
A more detailed system setup procedure can be found in the section describing the System Setup
Wizard.
21
Step-by-step system setup for Stand-Alone use
Stand-alone use. Genelec DSP loudspeakers can be used like any other loudspeaker system, without
the GLM control network. This is known as stand-alone use.
• Note that when a two-way loudspeaker detects a valid AES/EBU word clock, the system will sync
and run in the digital input mode.
• DSP subwoofers only have digital audio inputs and can be used in
AES/EBU-digital audio.
• When DSP two-way loudspeakers are used as analog loudspeakers, analog subwoofers can be
used.
• All Genelec DSP loudspeakers feature a user interface with switches and a rotary level control.
These are used for stand-alone operation.
• For more information on setting up and using loudspeakers in
on stand-alone operation.
stand-alone mode, see the section
stand-alone mode running
22
PLACING LOUDSPEAKERS IN THE MONITORING ROOM
Here is a quick introduction to monitoring loudspeaker placement.
• Place the loudspeakers in their expected positions before cabling anything.
• For most applications, the two-way loudspeakers (8240A and 8250A) should be located within
2-3 meters (7-10 ft.) of the primary listening position.
• Attempt to place all loudspeakers at ear height for the person in the primary listening position. If
a loudspeaker is higher than ear height, tilt and turn the loudspeaker toward the listening
position. Genelec two-way loudspeakers
which enables the positioning of the loudspeaker towards to the primary listening position.
• Aim the acoustic axis of all loudspeakers towards the main listening position both horizontally
(turn towards the listening position) and vertically (tilt towards the listening position).
• Position subwoofer(s) close to the wall(s).
• If a subwoofer is used, remember that all audio cables must go to the subwoofer first and then to
the loudspeakers. Make sure that enough cable length is available to move the subwoofer around
the room to find a location of optimal performance.
The following sections provide more detailed information about placing loudspeakers in a monitoring
environment.
Full-bandwidth loudspeaker placement
Minimum distance from a wall behind a loudspeaker. Genelec two-way DSP loudspeakers (8240A
and 8250A) should be placed so that a minimum distance of 5 cm (2”) is left behind the loudspeaker for
amplifier cooling and rear opening reflex port sound radiation.
feature a vibration-isolating monitor stand, the IsoPod™,
Low frequency cancellations. In general, when a loudspeaker’s front baffle is more than 0,3 meters (1
foot) away from the wall behind the loudspeaker, a reflection from this wall can cause a cancellation of low
frequencies and hence reduction of bass output. For two-way loudspeakers, low frequency cancellations
in the 40 – 80 Hz frequency range should be avoided. Cancellations in the 80 - 200 Hz range should also
be avoided if possible.
23
Recommended distances. Translating this into distance recommendations shows that loudspeakers
can be placed close to a wall (see above) at a distance less than 1 meter (3 ft.). Distances between 1
and 2.2 meters (3-7 ft.) should be avoided.
Loudspeakers placed more than 2.2 meters (7 ft.) away from walls may suffer from cancellations around
the low frequency cut-off of the loudspeaker limiting low frequency bandwidth. As a rule of thumb, the
lower the low frequency cut-off the further away the loudspeaker must be placed from the wall in order to
avoid this phenomenon.
Distances to the ceiling and other walls may be shorter than the distance to the wall behind a loudspeaker.
Reflections from these surfaces may be important and should also be considered.
Recommended distances from a single wall to the front baffle of free-standing loudspeakers.
Correct (green), acceptable (orange) and not recommended (red).
24
Subwoofer placement
Subwoofers can make life much easier in producing high quality low frequency reproduction. When a
subwoofer is used, the loudspeakers can be placed more freely, thereby allowing more flexibility in finding
a good location in the room for the reproduction of low frequencies.
A subwoofer should be placed close to a wall, preferably closer than 0.6 meters (2 ft.) from a wall. This
placement eliminates most possible cancellation sources and the subwoofer response remains flat and
well loaded.
Recommended distances from a single wall to the front baffle of loudspeakers combined with subwoofer(s).
Correct (green), acceptable (orange) and not recommended (red).
Using a subwoofer provides an additional crossover frequency (typically at 85 Hz). This makes placing
loudspeakers much easier. Acceptable distances extend to 1.1 m because of the low frequency cut-off
of loudspeakers. Loudspeakers may be placed 1.1…2 m without serious compromises due to the wall
behind the loudspeaker causing serious cancellation effects.
Although Genelec subwoofers provide accurate phase control at the crossover point, loudspeakers
should not be placed further than 2 m (7 ft.) from a supporting subwoofer. Larger distance differences may
cause tonal balance differences around the crossover frequencies due to loudspeakers and subwoofer(s)
exciting different room modes.
25
Multi-channel System Layout
The positioning of tables, screens, racks, etc, is critical in order to maintain accurate imaging. Early
reflections can smear the of the sound image and compromise localization. To avoid this, reflecting
surfaces between loudspeakers and the listening position should be minimized. Symmetrical positioning
of equipment is essential. Even with symmetry, reflecting surfaces should be removed from the vicinity
of acoustic paths.
Front loudspeaker, multi-channel layout. For multi-channel audio the Left and Right loudspeakers
should be placed 60 degrees apart, with the Center loudspeaker in the middle. All loudspeakers should
be of the same type so there are no coloration changes when panning sounds across the front stage.
Left figure: Example of non-symmetrical layout producing reflections from computer screens and
table surface totally different for different loudspeakers. This situation creates front-back and left-right
localisation smearing. Right figure: Symmetrical layout minimizes reflection surfaces and maintains
accurate localisation because reflections are similar due to symmetry.
26
Recommended loudspeaker positioning for 5.1 multi-channel audio reproduction.
Surround loudspeakers. Surround loudspeakers should be placed in a positional window between
±100 to ±120 degrees from the centerline. If more than two loudspeakers are used an equal number of
loudspeakers should be placed symmetrically on both sides of the center line, on a circle between ±60 to
±150 degrees. Most recording engineers choose ±110…130-degree position for a surround stereo pair.
System location in room. It is important that the multi-channel installation is symmetrically located in the
room. Reflections created by boundaries should be identical from left to right so that spatial information
and panning of sources remains stable. It is also recommended that the listening position be located in
the front half of the room so that the direct sound level is maximized relative to the reverberant energy in
the room.
Aiming of acoustical axes. All loudspeakers should be aimed towards the engineer’s listening
position.
27
GENELEC LOUDSPEAKER MANAGER GLM
Overview
The Genelec Loudspeaker Manager GLM is the control software for Genelec DSP loudspeaker systems.
The GLM runs on PC (Windows XP) and Macintosh (OSX) computer platforms.
The GLM knows which DSP loudspeakers are present on the control network and provides access to all
loudspeaker settings and system level controls.
The GLM is capable of controlling a combination of up to 30 main loudspeakers and subwoofers and
offers control of everything within the loudspeaker system. This includes controls built into individual
speakers as well as full system controls including monitoring volume, mute/solo for audio channels, audio
channel Group selection and more.
All settings can be collectively stored into the computer as a System Setup File. Loading a System Setup
File recalls all system level settings and sets all settings inside each loudspeaker, including acoustic
calibration.
Using the GLM, all acoustic settings can also be stored into each loudspeaker for stand-alone use.
The basic structure of a GLM Control Network has the following components
• Computer running the GLM software.
• One
• The GLM
• Network cable connected to all loudspeakers on the control network.
28
USB port of the computer connected to the GLM Network Interface.
Network Interface.
GLM Control Network
GLM Network Interface
The GLM Network Interface serves as the communicator between all loudspeakers on the control
network and the computer. Attach the GLM Network Interface to a USB port. The device driver is installed
automatically.
The USB cable runs from the computer to the GLM Network Interface. Once the GLM Network Interface
is connected to the computer flashing lights on the interface indicate that the network is active. If no
communication lights are flashing, check that the control network cable and the USB cable are securely
attached and the GLM software is running.
The Genelec loudspeaker control network runs on CAT5 cables. These are the same cables that are used
for Ethernet. Instead of using Ethernet for communication with loudspeakers, Genelec uses a proprietary
protocol defining the method of communication, and the GLM Network Interface that connects to the USB
port on the computer.
There are several important reasons why a USB interface is used instead of, for example, the Ethernet.
This keeps the network running at all times, even if the computer crashes. The GLM Network Interface
acts as the master controller on the network, and communicates to all loudspeakers even if the computer
is rebooting.
The Genelec network uses a proprietary communication protocol to ensure integrity of communication
to and from loudspeakers. The GLM Network Interface is used as a translator between the Genelec
control network and any computer hardware using it. This ensures that loudspeaker control traffic
remains insulated and secured from any public networks. This is necessary because of the possibility of
congestion on public networks (loudspeaker control messages do not get through), and in order to limit
the range of access (outsiders on a public network could possibly control the loudspeakers).
The USB interface is ubiquitous in the computer world. A USB cable run is normally limited to 5 m (15 ft.),
but this is not a problem. The computer network cable from the GLM Network Interface can extend to any
practical distance needed. If the GLM Network Interface cannot be placed close the computer the USB
cable can be extended with actively buffered cables up to 25 meters (75 ft.) in length.
29
Note
If the GLM Network Interface is disconnected or the computer is powered down, the GLM will no
longer control the loudspeakers. In that event, the loudspeakers maintain their current settings until the
loudspeaker is powered down.
When the loudspeakers are re-powered and the GLM software is not controlling the network, the loudspeakers obtain acoustic settings based either on the user interface controls on the loudspeaker (manual
controls) or from their internal memory (stored settings). This choice is determined by the position of
switch marked “STORED/MANUAL CTRL”.
GLM Control Network Cabling
Control comes from the computer running the GLM software. The computer connects to the GLM Network
Interface via the USB port (a 1.5-meter USB cable is provided). The GLM Network Interface connects
onwards to all loudspeakers using network cable.
The GLM Control Network starts from the GLM Network Interface and connects to the first loudspeaker
(any one, just take a pick) and then onwards until all loudspeakers have been connected.
Each loudspeaker has two control network connections. One is used as the input and the other as the
output to the next loudspeaker. It does not matter in which order the loudspeakers are connected on the
GLM Control Network. On the last loudspeaker of the control network chain, only one of the two Genelec
control network connectors will be used.
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