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AUDIO PRECISION 1038BCANEC
LEVEL(dBr)
dBr
+90
+85
+80
BASS TILT
+90
+85
+80
BASS LEVEL
+90
+85
BASS ROLL-OFF
+80
20
50
100
200
Figure 8: The curves above show the effect of the 'bass', 'mid' and
'treble' level controls, and the 'bass tilt' and 'bass roll-off' controls
on the free field response of the HT320AC, measured at 2 m.
In a solid wall (e.g. concrete) structure,
the space around the cabinet should be
filled with either absorbent mineral wool or
sand bags (see figure 5).
The wall can also be constructed of a
combination of materials to achieve high
acoustical structural mass that will disable
low frequency sound propagation and pro-
vide high LF sound isolation (see figure 6).
Acoustic consultants will be able to provide
details and design these structures.
Ensure that the cabinet is flush with the
surface of the wall. Discontinuities in the
loudspeaker mounting wall will cause dif-
fraction, which leads to inferior frequency
response and stereo imaging. So, if a deco-
rative cloth frame is used to cover the wall,
make sure that the edges adjacent to the
speaker are less than 20 mm (
The cloth must be very thin Tricot or an
acoustically transparent material other-
wise the high frequency response of the
system will be adversely affected. Genelec
approved cloth grilles are available.
Mode indicator LEDs
The Genelec HT320AC is provided with a
three-colour indicator LED on the DCW™
panel. When the LED is green, it indicates
that the loudspeaker is ready for use.
Standby mode is indicated by yellow colour.
Amplifier clipping is indicated by a blinking
red light and thermal protection mode by
a constant red light. If clipping is indicated
vs
FREQ(Hz)
22 OCT 02
TREBLE LEVEL
MID LEVEL
500
1k
2k
5k
10k
reduce the signal level so that the LED stops
blinking. If the red LED stays on constantly,
switch off the loudspeaker and the audio
source and let the amplifier cool down.
Check that the ventilation around the ampli-
fier is not blocked. There should be a clear-
ance of more than 100 mm (4") between the
amplifier face panel and any solid surface at
the back. If the red light does not come off,
contact authorised Genelec service.
The LED can be deactivated if you find
it disturbing in a darkened room by turning
both the "POWER LED" and "STANDBY
LED" switches on the amplifier panel to
"OFF".
Maintenance
No user serviceable parts are to be found
3
/
") deep.
within the amplifier unit. Any maintenance
4
or repair of the unit should only be under-
taken by qualified service personnel.
Safety considerations
Although the HT320AC has been designed
in accordance with international safety
standards, to ensure safe operation and to
maintain the instrument under safe operat-
ing conditions, the following warnings and
cautions must be observed:
1. Servicing and adjustment must only
be performed by qualified service
personnel. The amplifier must not be
opened.
AUDIO PRECISION 1038BCANEC
dBr
+95
+90
+85
+80
+75
+70
+65
+60
+55
20
50
100
20k
Hz
Figure 9: The curves above show the horizontal directivity
characteristics of the HT320AC in its horizontal configuration
measured at 2 m.
LEVEL(dBr)
vs
FREQ(Hz)
0°
15°
30°
45°
200
500
1k
2k
5k
2. Do not use the loudspeaker with an
unearthed mains cable or unearthed
mains connection as this may lead to
personal injury.
3. This loudspeaker is capable of
producing sound pressure levels in
excess of 85 dB, which may cause
permanent hearing damage.
4. Free flow of air around the amplifier is
necessary to maintain sufficient
cooling. Do not obstruct airflow around
the amplifier.
5. 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 or near the
loudspeaker or the amplifier.
6. Note that the amplifier is not
completely disconnected from the AC
mains service unless the mains cable
is removed from the amplifier or the
mains outlet.
Accessories
Order code
Protective grille
1038-409BC
Guarantee
This product is supplied with one year
guarantee against manufacturing faults or
defects that might alter the performance of
the HT320AC unit. Refer to supplier for full
sales and guarantee terms.
22 OCT 02
10k
20k
Hz
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