Setting Tone Controls; Mounting Options; Flush Mounting - Genelec 1038CF Operating Manual

Loudspeaker mounting Bass
position roll-off
Free anechoic response None
Free standing in a None
damped room
Free standing in a None
reverberant room
In a corner -2 dB
Soffit mounted in a control None
room wall
Table 1. Suggested tone control settings for different acoustic environments
A1 B1
277 (10 7/8") 196 (7 11/16")
Figure 1. Location of the acoustic axis
of the mixing console or other source, by use
of the input sensitivity control on the rear panel
(see Figure 2). A small screwdriver is needed
for the adjustment. The manufacturer default
setting for this control is -6 dBu (fully clock-
wise) which gives an SPL of 100 dB @1m with
-6 dBu input level. To get the full output level of
118 dB SPL from the 1038CF an input level of
+10 dBu is needed at this setting.

Setting tone controls

The acoustic response of the system may
also have to be adjusted to match the acoustic
environment. The adjustment is done by set-
ting the five tone control switch groups 'bass
tilt', 'bass roll-off', 'bass level', 'mid level' and
'treble level' on the rear panel of the amplifier.
The manufacturer's default settings for these
controls are 'All Off' to give a flat anechoic
response. See Table 1 for suggested tone
control settings in differing acoustic environ-
ments. Figures 7 and 8 show the effect of the
controls on the anechoic response. Always
start adjustment by setting all switches to
the 'OFF' position. Then set only one switch
per group to the 'ON' position to select the
response curve required. If more than one
switch is set to 'ON' (within one switch group)
the attenuation value is no longer accurate.
Bass tilt Bass Midrange Treble
level level level
None None None None
-2 dB None None None
-2 dB -2 dB None None
-2 dB -2 dB None None
None -4 dB None None
A2 B2
456 (17 15/16") 235 (9 1/4")

Mounting options

The 1038CF has two M10x30 threads on
both sides of the enclosure and one M10x30
thread above the amplifier on the back of the
enclosure. These can be used for securing
the loudspeaker in its place. There is also an
adapter for a 35 mm tube type loudspeaker
stand at the bottom of the enclosure.
The loudspeakers are delivered either for
vertical or horizontal mounting. In the hori-
zontal mounting position the bass drivers
should point inwards to obtain better low
frequency coupling. If the loudspeaker posi-
tioning needs to be changed, the DCW plate
can be rotated so that the midrange driver
remains always located at the bottom of the
DCW. Remove the four corner screws of the
DCW and pull the plate carefully out without
stressing the wires and the gasket. Rotate
the plate 90 degrees in the appropriate direc-
tion and remount the screws.

Flush mounting

The 1038CF can be used flush mounted
into the control room wall, which offers some
acoustical benefits. No enclosure edge dif-
fraction will occur, resulting in an improved
response, especially at midrange frequen-
Figure 2. Amplifier panel layout of the 1038CF.
cies. Low frequency reflections from the wall
behind the loudspeaker can be avoided,
which improves the low frequency response
and efficiency and allows the loudspeaker
to work in half space conditions. In terms of
installation and orientation, the loudspeaker's
acoustical axis (See Figure 1.) should also
point directly to the listening position. The
loudspeaker should be vertically aimed so
that the acoustical axis of the loudspeak-
ers meet midway between the standing and
seated listening position (1.4 m - 4'7" from the
floor). In the horizontal plane the loudspeaker
should be positioned according to the stand-
ard stereophonic (60 degrees between
left-right channels) or multichannel (ITU-R
BS.775-1) placement recommendation.
As the amplifier unit is located at the back
of the loudspeaker enclosure, it must be
removed before flush mounting the loud-
speaker. The amplifier can be attached to a
rack mount chassis (order code 1037-412)
and placed in an equipment rack so that
amplifier cooling and access to the controls
is provided.
The ceiling, side walls and especially the
rear wall should be acoustically absorbent at
low frequencies. The wall in which the loud-
speakers are mounted should have a high