1
1
1
1
1
Recommended position.
2
2
2
2
2
Positioning the subwoofer in a corner causes a bass
frequency boost.
3
3
3
3
3
This arrangement may cause a loss in low
frequencies if the distance from the listening position
to the front wall is between 1 and 3 m (3'3" - 10').
4
4
4
4
4
The 'Soffit', flush mount or cabinet mount is also
recommended. Here the vents must radiate into
the room.
Safety Considerations
Safety Considerations
Safety Considerations
Safety Considerations
Safety Considerations
-
Servicing and adjustment should
only be performed by qualified
service personnel.
-
Opening the amplifier's rear panel
is strictly prohibited.
-
It is forbidden to use this product
with an unearthed mains cable,
which may lead to personal injury.
-
Do not expose the unit to water or
moisture.
Warning!
This equipment is capable of delivering
sound pressure levels in excess of
85dB, which may cause permanent
hearing damage.
Maintenance
Maintenance
Maintenance
Maintenance
Maintenance
No user serviceable parts are to be
found within the amplifier unit. Any
maintenance of the unit should only be
undertaken by qualified service
personnel. Ensure that if fuse
replacement is required, only fuses of
the appropriate voltage and current
ratings are used. REMEMBER to
disconnect the power supply by
removing the mains cable before fuse
replacement.
Guarantee
Guarantee
Guarantee
Guarantee
Guarantee
This product is supplied with a two year
guarantee against manufacturing faults
or defects that might alter the
performance of the unit. Refer to supplier
for full sales and guarantee terms.
Figure 2. Subwoofer positioning and suggested "Bass roll-off"
settings. Unless mentioned otherwise, the vents of the subwoofer
should face towards the nearest wall.
Setting the Phase
Setting the Phase
Setting the Phase
Setting the Phase
Setting the Phase
Control
Control
Control
Control
Control
The effect of incorrect phase alignment
between main speakers and subwoofer
is a drop in the frequency response of
the whole system at the crossover
frequency. The graphs below (figure 3)
Figure 3. The effect of phase difference
between the subwoofer and the main
loudspeakers
show the effect of phase difference on
the frequency response.
The phase difference between the main
speakers and subwoofer at the listening
position is dependent upon the
positioning of the subwoofer. To avoid
phase differences between the left and
right channels and the subwoofer, the
subwoofer should be placed at the
center of the front speaker array.
Coarse Phase Correction Method
Coarse Phase Correction Method
Coarse Phase Correction Method
Coarse Phase Correction Method
Coarse Phase Correction Method
• Configure the processor so that the
main speakers (L, C, R) are set to "small"
or HPF @ 120 Hz.
• Connect an audio frequency signal
generator to one of the input channels
used in the system.
• Set the frequency generator to 120Hz.
If a signal generator is not available
then it is possible to use an audio test
recording with a test frequency in the
range 105 Hz to 135Hz.
P h a s e D i f f e r e n c e : 0 °
P h a s e D i f f e r e n c e : 9 0 °
P h a s e D i f f e r e n c e : 1 8 0 °
P h a s e D i f f e r e n c e : 2 7 0 °
1 2 0 H z
1 2 0 H z
1 2 0 H z
1 2 0 H z
After the phase setting has been
completed, return the speaker
configuration on the processor to its'
original settings.
ON
1234
• Next toggle the -90° phase
switch 'on' and 'off', and again
set it to the position which gives
the lowest sound level.
ON
1234
•Toggle the -180° phase
switch 'on' and 'off' and set it
to the position which gives the
lowest sound level at the
listening position.
ON
1234
• Finally, set the -180° phase
switch to the opposite setting.
