Genelec 8240APM User manual
Operating Manual
8260A, 8250A and 8240A
DSP Loudspeakers
Introduction
Congratulations and a thank-you for the purchase of this Genelec 8200 Series DSP Loudspeaker. 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 loudspeakers also have analog inputs, making them versatile and
intelligent replacements for analog loudspeakers.
This manual addresses setting up and using the 8240A, 8250A
and 8260A DSP loudspeakers in stand-alone mode without the
Genelec Loudspeaker Manager GLM™ and the proprietary
Genelec loudspeaker control network. Use with the GLM™ is
described in the DSP System Operating Manual.
EC Declaration Of Conformity
This is to certify that Genelec 8240A, 8250A and 8260A DSP
loudspeakers conform to the following standards:
Safety: EN 60065:2002 + A1:2006 + A11:2008 / IEC 60065:
2001 7th Edition
EMC: EN 55020: 2007 EN 55013: 2001 + A1: 2003, EN 61000-32: 2006 and EN 61000-3-3: 1995 + A1: 2001 + A2: 2005
The products herewith comply with the requirements of The Low
Voltage Directive 2006/95/EC EMC Directive 2004/103/EC and
Energy related Products Directive 2009/125/EC.
Signed:
Ilpo Martikainen
Position: Chairman of the Board
Date: 23-February-2011
Compliance to FCC Rules
This device complies with part 15 of the FCC Rules. Operation is
subject to the following two conditions:
the equipment off and on, the user is encouraged to try to correct
the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and
receiver.
• Connect the equipment into an outlet on a circuit different
from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician
for help.
Modifications not expressly approved by the manufacturer could
void the user’s authority to operate the equipment under FCC
rules.
Safety Considerations
Although the 8240A, 8250A and 8260A have been designed in
accordance with international safety standards, to ensure safe
operation and to maintain the loudspeaker under safe operating conditions, the following warnings and precautions must be
observed:
• Servicing and adjustment must only be performed by
qualified service personnel. The loudspeaker enclosure
must not be opened.
• Do not use this product with an unearthed mains cable or
a mains connection without the protective earth contact as
this may lead to personal injury.
• To prevent fire or electric shock, do not expose the unit to
water or moisture.
• Do not place any objects filled with liquid, such as vases on
the loudspeaker or near it.
• Note that the amplifier is not completely disconnected
from the AC mains service unless the mains power cord is
removed from the amplifier or the mains outlet.
• Free flow of air behind the loudspeaker is necessary to
maintain sufficient cooling.
• Do not obstruct airflow around the loudspeakers.
• This device may not cause harmful interference, and
• This device must accept any interference received, including
interference that may cause undesired operation.
Note: This equipment has been tested and found to comply with the
limits for a Class B digital device, pursuant to part 15 of the FCC
Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and,
if not installed and used in accordance with the instructions, may
cause harmful interference to radio communications. However,
there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning
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WARNING!
All Genelec 8200 Series loudspeakers are capable of producing sound pressure levels in excess of 85 dB, which may cause
permanent hearing damage.
System
Genelec 8240A, 8250A and 8260A DSP Loudspeakers are designed for precise monitoring of 24 bit/192 kHz AES/EBU digital audio signal or line level analog audio signal. They are fully
compatible with Genelec Loudspeaker Manager GLM™ and the
proprietary Genelec loudspeaker control network, and Genelec
7260A, 7270A and 7271A DSP Active Subwoofers, but can also
be used independently of these. The 8240A, 8250A and 8260A
Figure 1. Connectors and controls on the back panel of a 8260A. 8240A and 8250A share the same layout but without the
12 V trigger voltage connector.
feature high SPL output, low colouration and broad bandwidth
in a small enclosure size. They are suitable for a wide variety
of tasks, such as near field monitoring, mobile vans, broadcast
and TV control rooms, surround sound systems and home studios. The Minimum Diffraction Enclosure™ (MDE™), advanced
Directivity Control Waveguide™ (DCW™) and Minimum Diffraction Coaxial (MDC™) technologies provide excellent frequency
balance even in difficult acoustic environments.
Amplifiers
The amplifier unit is mounted in the rear of the loudspeaker enclosure. The unit incorporates special circuitry for driver thermal
overload protection. Variable input sensitivity allows accurate
level matching to console output section.
Using the Loudspeakers in Stand-Alone
Mode
The 8240A, 8250A and 8260A accept both analogue line level
input signals and AES/EBU formatted digital input signals.
When the loudspeakers are not connected to Genelec loudspeaker control network, they operate in the stand-alone mode.
However, settings made with the Genelec Loudspeaker Manager
software can be saved into each loudspeaker and applied even
when the network is disconnected by setting switch 1 “STORED/
MANUAL CONTROL” on switch group 2 of each loudspeaker to
position “STORED.”
This manual concentrates on using the loudspeakers without the
control network. All issues concerning use with the network are
explained in detail in the System Operating Manual provided with
the GLM™ Loudspeaker Manager software kit.
Connections
Each loudspeaker is supplied with a mains cable, one 5 m GLM
network cable and an operating manual. Before connecting up,
ensure that the mains switch is off.
“MAINS INPUT” Connector
Connect the mains supply to this connector.
“DIGITAL IN AES/EBU” Connector
Use this female XLR connector for AES/EBU formatted digital
audio input signals. This input is selected automatically when a
valid digital audio signal is present, and overrides the analogue
input.
Depending on the digital hardware, transmission of a 192 kHz
sample rate is achieved using a double speed, single channel/
cable interface. This is called dual-wire mode. In this case one
cable per channel is used and no channel selection is required.
Dual-wire mode is automatically detected by the input stage.
If the digital source device has a digital level monitor pot or
graphical volume fader that controls the digital level, it may be
advantageous to lower the level control either on the computer
interface or the loudspeaker’s back panel controls, which in turn
will force the use of more of the digital [bit] resolution in the volume control.
If the digital inputs are used, all audio outputs are referenced
to 0 dBFS (digital Full Scale, the largest level that may be represented in the AES/EBU signal). Genelec DSP loudspeakers
produce 100 dB SPL at 1 meter in free space for a digital input
signal of –30 dB FS. It is advantageous to keep the digital level
as high as possible.
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“DIGITAL THRU AES/EBU” Connector
Mounting Considerations
This male XLR carries an unaltered copy of the digital signal fed
into the “DIGITAL IN AES/EBU” connector. It can be used for
daisy-chaining up to four loudspeakers together.
“ANALOG IN” Connector
Use this connector for analog audio signals. When operating an
8200 Digital system in the analog mode the A/D converter must
not be overloaded, otherwise distortion will be heard. The maximum input level is +7.0 dBu RMS on models 8240A and 8250A
and +22.0 dBu RMS on model 8260A. When A/D converter input
clip occurs the front panel light turns momentarily red, indicating
the overload condition.
If the “Level” control on the back panel is reduced (turned counter-clockwise), the acoustic output will be reduced. This control
decreases the output from the D/A converters. Ideally the Level
control should be set to force the use of more of the input range
of the A/D converter without overloading it. Remember, there
is no headroom above the maximum input to the A/D conversion.
“CONTROL NETWORK” Connectors
Use these RJ-45 sockets to connect the loudspeaker to the proprietary Genelec Loudspeaker Manager™ (GLM™) network
only. This connector is not Ethernet LAN compatible. Do not connect to Ethernet LAN.
“12 V REMOTE” Connector (8260A only)
You can set up remote controlled powering up and down of
the 8260A’s with 12 V trigger voltage connected to this connector. The minimum current needed to actuate this function
is 70 mA.
Front Panel Warning Light
Normally the light on the front panel of an 8200 loudspeaker is
green, indicating that the loudspeaker is in normal operational
mode.
The overload light (red) is activated by several events:
• exceeding the maximum input range of the analog input
• exceeding the maximum input range of the digital input with
large probability
• exceeding the output capacity of the power amplifier
(clipping in the power amplifier) and thermal
overload of the power amplifier or loudspeaker drivers
(thermal protection has activated)
• if an error is detected in the AES/EBU audio data
If a red warning light appears, turn the analog source down! If
the levels are already modest and a digital signal is being used,
ensure that there are no bit errors in the AES/EBU digital audio
data.
Align the Loudspeakers Correctly
Always place the loudspeakers so that their acoustic axes are
aimed towards the listening position (see Figure 2). Vertical
placement is preferable, as it minimises acoustical cancellation
problems around the crossover frequency.
Maintain Symmetry
Check that the loudspeakers are placed symmetrically and at an
equal distance from the listening position. If possible, place the
system so that the listening position is on the centerline of the
room and the loudspeakers are placed at an equal distance from
the centerline (See Figure 3).
Minimise Reflections
Acoustic reflections from objects close to the loudspeakers like
desks, cabinets, computer monitors etc. can cause unwanted
colouration and blurring of the sound image. These can be minimised by placing the loudspeaker clear of reflective surfaces. For
instance, putting the loudspeakers on stands behind and above
the mixing console usually gives a better result than placing them
on the meter bridge. Symmetrical positioning of the reflective objects is also importent in order to maintain a balanced soundstage
(See Figure 3).
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. 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
(See Figure 4).
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
Minimum Clearances
Sufficient cooling for the integrated amplifier and functioning of
the reflex port must be ensured if the loudspeaker is installed in a
restricted space such as a cabinet, or integrated into a wall structure. The surroundings of the loudspeaker must always be open
to the listening room with a minimum clearance of 5 centimeters
(2”) behind, above and on both sides of the loudspeaker. The
space adjacent to the loudspeaker must either be ventilated or
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