Setting The Input Sensitivity - Genelec 8260A Operating Manual

Maintain Symmetry
Check that the monitors 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 monitors are placed at an equal distance
from the centerline (See Figure 4).
Minimise Reflections
Acoustic reflections from objects close to the monitors like
desks, cabinets, computer monitors etc. can cause unwanted
colouration and blurring of the sound image. These can be mi-
nimised by placing the monitor clear of reflective surfaces. For
instance, putting the monitors on stands behind and above the
mixing console usually gives a better result than placing them
on the meter bridge. Symmetrical positioning of the reflec-
tive objects is also important in order to maintain a balanced
soundstage (See Figure 4).
Low Frequency Cancellations
In general, when a monitor's front baffle is more than 0.3 me-
ters (1 foot) away from the wall behind the monitor, a reflection
from this wall can cause a cancellation of low frequencies and
hence reduction of bass output. Distances between 1 and 2.2
meters (3-7 ft.) should be avoided (See Figure 5).
As a rule of thumb, the lower the low frequency cut-off the
further away the monitor 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 monitor. Reflections from these
surfaces may be important and should also be considered
Operating Environment
These monitors are designed for indoor use only. The permissa-
ble ambient temperature is 15-35 degrees Celsius (50-95°F) and
permissable relative humidity between 20% and 80%. Humidity
condensation on the product is not allowed during use. If the
product has been stored or transported in a cool environment
and then taken into a warm room, it must be allowed to warm
up completely before connecting to mains power.
Sufficient cooling for the amplifier and functioning of the reflex
port must be ensured if the monitor is installed in a restricted
space such as a cabinet, or integrated into a wall structure.
The surroundings of the monitor must always be open to the
listening room with a minimum clearance of 5 centimeters (2")
behind, above and on both sides of the monitor. The space
adjacent to the monitor must either be ventilated or suffi-
ciently large to dissipate heat so that the ambient temperature
does not rise above 35 degrees Celsius (95°F).
Mounting Options
The vibration insulating Isolation Positioner/Decoupler™ (Iso-
Pod™) table stand allows tilting of the monitor for correct
Figure 7. System Level rotary control
Figure 8. Switch Group 1
alignment of the acoustic axis. The stand can be attached to
three mounting points allowing vertical and symmetrical hori-
zontal positioning.
Genelec 8240A, 8250A, 8351A and 8260A can be fitted to König
& Meyer monitor mounts on two sets of M6x10 mm threaded
holes on the back of the enclosure. On the base of the 8240A
and 8250A enclosure is an M10x10 mm threaded hole which
can be used for securing the monitor to its base. Do not use
this thread for mounting the monitor on a microphone stand
which has a 3/8" UNC thread. A wide variety of ceiling and wall
mounts are available through your Genelec dealer.

Setting the Input Sensitivity

The monitor level sensitivity functions for both analog and digi-
tal input. The sensitivity can be matched by adjusting the rotary
Level control together with the System Level switches located
in the switch group 2. (switches 6 and 7). The switches provide
attenuation levels of -10 dB (sw. 6 ON), -20 dB (sw. 7 ON) and
-30 dB (both switches ON) The combined attenuation ranges
from 0 to -42 dB.
Functions On Switch Group 1
(Tone Controls)
Switch group 1 (the upper switch group) comprises the tone
controls that can adjust the frequency response of the sys-
tem in stand-alone mode to match the acoustic environment.
Please note that the GLM software allows a much more ver-
satile and precise set of controls to be used and supports the
fully automatic system alignment feature, the Genelec Auto-
Cal. Use the tone control switches on the monitor only if GLM
is not available for the system calibration.
The controls are labelled "TREBLE TILT", "BASS TILT", "BASS
ROLL-OFF" and "DESKTOP". The factory settings for these
5