User Manual

4
Desktop low frequency control
The desktop low frequency control (fifth
switch of first switch group from the left)
attenuates the bass frequencies around
160 Hz by 4 dB (see figures 7 and 9). This
feature is designed to compensate for the
boost often occurring at this frequency
range when the loudspeaker is placed upon
a meter bridge, table or similar reflective sur-
face.
Bass tilt control
The bass tilt control switches (second switch
group from the left) offer three attenuation
levels for the bass response below 800 Hz,
usually necessary when the loudspeak-
ers are placed near room boundaries. The
attenuation levels are -2 dB, -4 dB and
-6 dB.
Treble tilt control
Treble tilt (third switch group from the left)
allows adjusting the treble response above
5 kHz by +2, -2, or -4 dB, which can be used
for correcting an excessively bright or dull
sounding system.
An acoustic measuring system such as
WinMLS is recommended for analyzing the
effects of the adjustments, however, care-
ful listening with suitable test recordings can
also lead to good results if a test system is not
available. Table 1 shows some typical settings
in various situations. Figures 7 and 9 show
the effect of the controls on the anechoic
response.
Always start adjustment by setting all
switches to “OFF” position. Then set only one
switch per group to the “ON” position to select
the desired adjustment. If more than one
switch is set to “ON” (within one switch group)
the attenuation value is not accurate.
Measure or listen systematically through
the different combinations of settings to find
the best frequency balance.
Maintenance
No user serviceable parts are to be found
within the loudspeaker cabinet or the amplifier
unit. Any maintenance or repair of the loud-
speaker should only be undertaken by quali-
fied service personnel.
Safety considerations
Although the 8040B and 8050B 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 cautions must be observed:
• Servicing and adjustment must
only be performed by qualified service
personnel. The loudspeaker must not be
opened.
• Do not use this product with an
unearthed mains cable 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.
• Do not expose the loudspeaker to
water or moisture. Do not place any
objects filled with liquid, such as vases on
the loudspeaker or near it.
WARNING!
Genelec 8040B and 8050B loudspeakers are
capable of producing sound pressure levels in
excess of 85 dB, which may cause permanent
hearing damage.
Table 1. Suggested tone control settings in some typical situations
Speaker Mounting Position Treble tilt Bass tilt Bass roll-off Desktop LF
Flat anechoic response
None None None None
Free standing in a damped
room
None -2 dB None None
Free standing in a
reverberant room
None -4 dB None None
Near field on a reflective
surface
None -2 dB None -4 dB
In a corner
None -4 dB -4 dB None
-4 -6
dB
0
-2
+2
+2
0
-2
BASS
TILT
TREBLE TILT
MAINSINPUT
50 /60Hz110 W230 V~
BASS
ROLL-OFF
20Hz 160Hz
MAGNETICALLY SHIELDED
BI-AMPLIFIED
MONITORING SYSTEM
MADE INFINLAND
SERIAL NUMBER
ON
4kHz 20kHz800Hz
DESKTOP
CONTROL
OFF
+ - GND
3
www.genelec.com
292-8040T-6
INPUTSENSITIVITY
REQUIREDFOR
100dBSPL@1m
2
-6
-4
+6
dBu
+4
1
WARNING
AVERTISSEMENT
NOTE!THISMONITORSHOULD NOTBEMOUNTED ONAMICROPHONESTANDAS
ELECTRICSHOCKHAZARD.DO NOTOPEN. DONOTSUBJECTTO WATEROR
QUALIFIEDPERSONNEL.USEEARTHEDMAINSCONNECTIONONLY.
MOISTURE.NOUSERSERVICEABLEPARTSINSIDE.REFER SERVICINGTO
CARLEPAS DEVISESTDE TYPEM10. CETAPPAREILDOITÊTRERACCORDÉÀLA TERRE.
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THEBASETHREADISM10.
292-8040W
ALLOFF
TREBLE TILTBASS TILT
BASS ROLL-OFF
DESKTOP
CONTROL
ISS
DISABLE
8040B
Figure 5. The Iso-Pod™ can also be attached to the side of the enclosure for
horizontal mounting.
Figure 6. Carrying bag for a pair of 8040B loudspeakers.
Figure 4. K&M type wall mount