Mounting Considerations; Front Panel Warning Light - Genelec DSP 8260A Operating Manual

"DIGITAL THRU AES/EBU" Connector
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 maxi-
mum 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 coun-
ter-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 conver-
sion.
"CONTROL NETWORK" Connectors
Use these RJ-45 sockets to connect the loudspeaker to the pro-
prietary Genelec Loudspeaker Manager™ (GLM™) network
only. This connector is not Ethernet LAN compatible. Do not con-
nect 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 con-
nector. 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.
4

Mounting Considerations

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 mini-
mised 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 ob-
jects 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 frequen-
cies and hence reduction of bass output. Translating this into dis-
tance 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 struc-
ture. 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