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System
The GENELEC 1039A monitor is designed
for neutral sound reproduction at high SPLs
in large control rooms. The system com-
prises of a 320 litre cabinet and a 19" 7U rack
mount amplifier unit.
The speaker cabinet contains two 385mm
(15") bass drivers, a 130mm (5") midrange,
and a 25mm (1") treble driver. The midrange
and treble drivers are mounted in a Genelec
Directivity Control Waveguide (DCW) which
can be rotated through ±90° for either hori-
zontal or vertical mounting. The cabinet low
frequency -3dB point is at 29 Hz and the bass
response extends down to 25 Hz. The high
frequency response extends up to 22kHz
(-3dB).
Each amplifier unit contains a 3 channel
active crossover, driver overload protection
circuits, and 4 separate power amplifiers pro-
ducing 2 x 400W, 350W and 120W of short
term power in the bass, midrange, and treble
channels respectively. The crossover filter
incorporates tone controls to enable the user
to accurately match the speaker to the local
acoustic environment.
Unpacking
The Genelec 1039A monitoring system
can be transported as a pair or as a single
system. A pair is shipped in a single box,
containing two cabinets, two amplifier units,
two mains connecting cables, two LED con-
necting cables, two loudspeaker connecting
cables and one Allen key. (See Fig 1)
Before installing the system, check all
items for damage and omissions. If there are
any damaged products, contact directly the
distributor and insurance agent. If there are
any missing components, contact your local
dealer or Genelec.
Amplifier positioning
The Genelec 1039A amplifier electronics are
encased in two standard 19" 7U rack cases.
The unit should be well ventilated to pre-
vent excessive overheating, there must be a
supply of air to the front and sufficient ventila-
tion to dissipate the generated heat from the
space behind the amplifier unit. If the system
overheats it will stop operating until a safe
temperature is reached.
Make sure that the amplifier is positioned
so that the speaker connecting cables will
reach. Longer cable lengths can be ordered
from the manufacturer upon special request.
A space 120 mm deep should be left behind
the rear panel of the amplifier unit to allow for
the cable connectors.
Check that the amplifier unit is wired to the
correct mains voltage for your power supply.
The correct mains voltage for the amplifier
unit is shown at the bottom of the sticker on
the rear panel of the amplifier unit.
Loudspeaker positioning
The 1039A control room monitor is designed
to be flush mounted in either the vertical or
horizontal configuration. The DCW should
be rotated so that the treble and midrange
drivers align vertically. This ensures that opti-
mum stereo symmetry is obtained.
Note that the DCW plate is heavy, care
must therefore be taken when removing and
replacing the DCW. To rotate the DCW plate,
proceed as follows:
•
Place the speaker in its intended
listening orientation.
•
Unscrew the eight M5 fixing screws on
the edges of the plate using the 4 mm
Allen key provided with the system.
•
Carefully pull the plate a small distance
away from the cabinet.
•
Rotate the DCW so that the midrange
and treble drivers are aligned vertically
(treble driver on top) and remount the
DCW plate reversing the procedure
above.
Flush mounting of the
speaker
Although the 1039A may be used success-
fully as a free standing speaker, flush mount-
ing is strongly recommended for acoustical
reasons. Flush mounting improves the bass
response and efficiency and also enhances
the midrange transient and frequency
response.
The speaker has its
acoustical axis
midway between the midrange and treble
drivers. This axis should be used as the lis-
tening and measuring axis of the system.
(See Fig 2.1 and Fig 2.2)
The listening position should be between 2
... 3.5 m (6½ ... 11½') from the speakers. The
speaker should be aimed so that the verti-
cal acoustical axis of the two speakers meet
midway between the standing and seated
listening position (1.4 m - 4'7" from the floor).
This allows the correct frequency response to
be received by a standing or seated person.
The speakers should not be mounted too
high as this increases the required vertical
tilt of the speaker and reduces the optimum
listening area.
The ceiling, side walls and especially the
rear wall should be acoustically absorbent at
low frequencies. The speaker mounting wall
should be acoustically hard and therefore
reflective. The speaker mounting wall should
be angled so that the speakers are correctly
aimed. Great care should be taken over how
the speaker is mounted into the wall.
Note the following:
•
A space 50...100mm (2..4") wide can be
left around the speaker.
•
Cover the space around the speaker
with a facing panel, this should be fixed
to the wall. Leave a gap of about
5..10 mm (¼..½") between the speaker
and the panel. Fill this gap with a soft
rubber gasket to allow for possible
cabinet movement.
•
Ensure that the speaker cables can
reach the rear of the speakers.
•
If a light (e.g. wooden) wall is used,
the speaker cabinet should be mounted
on vibration isolators, with a resonant
frequency of around 2...8 Hz, to
prevent vibrations from being
transmitted to the wall and impairing
the low frequency performance. The
space around the cabinet should be
filled with absorbent mineral wool or
foam plastic. The walls must be well
braced.
•
For a solid wall (e.g. concrete), the
speaker may be directly mounted to the
wall without vibration isolators. The
space around the cabinet should be
filled with mineral wool or sand bags.
Discontinuities in the speaker mounting wall
will cause diffraction, which leads to inferior
frequency response and stereo imagery, so:
•
Ensure that the cabinet is flush with the
surface of the wall.
•
If a decorative cloth frame is used to
cover the wall, make sure that the edges
adjacent to the speaker are less than
20 mm (3/4") deep. The cloth must be
very thin Tricot or acoustically
transparent material, otherwise the high
frequency response of the system will
be adversely affected. Genelec
approved cloth grilles are available (part
number 1039-409).
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