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6. Controls & System Setup
8. The Aegis Neo Range
7. Specification
Type:
Closed box, active subwoofer.
Drivers:
0mm pulp cone with 48mm thermally
bonded voice coil. High-power long-throw magnet
system.
Low Frequency Cut-off:
- 6dB @ 6Hz
Amplifier:
00 Watts into 8 Ohms
Low Pass Filter:
Variable nd order, 45Hz to 50Hz
Phase:
Variable 0° to 80°
Notch Filter:
Variable. Frequency: 40 to 00Hz, Q: .5 to
5.0, Level: 0dB to -dB
Dimensions (H x W x D):
40 x 360 x 35mm
Weight:
7.0kg (single, unpacked)
Acoustic Energy reserves the right to modify product
specifications.
Select a few short examples of familiar programme material - both movie and
music - to use while adjusting the subwoofer. Listen also from a variety of different
positions in the room. Check for balance and consistency of sound - neither too
much nor too little bass across the range of programme material and listening
positions. Experimentation and careful listening is the key to finding a good
subwoofer setup.
Sub-woofer Location
Broadly speaking, the closer a subwoofer is to the corner of the room (assuming the
walls are solid), the more bass it will generate in the room (and the lower its volume
need be set). Moving the subwoofer closer to a corner however will also tend to
reduce the consistency of the subwoofer volume over the listening room (a corner
location being the worst in this respect). Positions closer to the corner will also tend
to change the character of the bass produced by the subwoofer - it will emphasise
the very lowest signals more. This change in bass character with location is the
variable that enables a good compromise position for the subwoofer to be found.
Volume Level
Setting the subwoofer volume is important in terms of both overall system balance
and the demands of different types of programme material. You may find that
material with an emphasis on music works better with a lower subwoofer volume
than movie material with an emphasis on “effects”. Finding a compromise between
the two is a matter of subwoofer volume adjustment in parallel with adjusting its
position in the room.
Crossover Frequency
As you adjust other parameters you may find that moving the crossover frequency
a little from the suggested starting value is beneficial. Adjust other aspects of the
setup, particularly subwoofer location and phase, before adjusting the crossover
frequency significantly.
Phase
Adjusting the subwoofer
Phase
should be left until after the Location is chosen
and the
Volume Level
and
Crossover Frequency
are set. Experiment with adjusting
the phase if it is proving difficult to get satisfactory results by location, volume and
crossover adjustment alone.
Notch Frequency, Notch Slope
and
Notch Level
If, while adjusting the subwoofer, it becomes apparent that a low frequency room
resonance (bass boom) is dominating the sound of the system, the
Notch Filter
can be used to suppress the resonance. First, set the
Notch Slope
to
MAX
and the
Notch Level
to
-12dB
. Now adjust the
Notch Frequency
in steps from 45Hz upwards
and listen to the effect on the sound. When the
Notch Frequency
matches the
frequency of the room resonance (usually between 60Hz and 90Hz in typically
dimensioned rooms) its effect on the sound will be suppressed. When the correct
frequency has been identified, adjust the
Notch Slope
and
Notch Level
to fine-tune
the sound. Aim for a high
Notch Slope
value and a low
Notch Level
(i.e. close to
0dB) value.
Note:
If the Notch Slope is set too low (especially if the
Crossover Frequency is set to a low value) it will begin
to operate more as a second volume control. Try to
keep the slope set relatively high.
Note:
The Notch Filter will have increasingly little
effect as its frequency is adjusted above the crossover
frequency (nominally 80Hz on audio-visual LFE signals).
Once the
Notch Filter
is set it will probably be
worthwhile revisiting and fine-tuning the
Volume Level
,
Crossover Frequency
and
Phase
settings again.