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The variable low-pass filter on the PA-STSUB100 can be used for system integration.
With the turn knob you can set the low-pass frequency from 50 till 150 Hz. For example
the frequency is set at 100 Hz; the signal amplitude will reduce with 12 dB every time
the frequency doubles.
Connecting your system:
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Make sure your complete system is turned off and all faders and controls should be set
at their minimum before connecting the speakers.
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Use the correct cables for your speaker system, referring to the specification sheet.
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Don't forget to connect the passive speaker to the speaker output of the active speaker.
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After all the connections are made, you are able to turn on the system.
Note: the PA-STSUB100 has an auto power switch on the back panel, with this function
the unit will turn into standby mode after 15 minutes of non-use.
Speaker positioning:
The speakers have to be placed well into the room in order to maximize the delay of
reflections and to remove their effects from the sphere of spatial perception.
The perfect and most effective distance lies between 85 cm (33 inch) and 1.5 m (5 ft) -
depending on the listener's position. However, you can also obtain very good results at a
distance of 70 cm (28 inch). An easy way to home in on the right distance is to sit down in
the listening seat and ask a friend to hold up a mirror and move it along the wall. As soon
as you see the speaker in the mirror, you know where the acoustic reflection comes from.
Now measure the distance between the speaker and mirror, and mirror and listening seat,
then subtract the distance between the speaker and listening seat. You will see from the
result whether you are above or below the critical distance of 1.7 m (5.6 ft).
If you are well below this value, you can try to dampen or diffuse critical room resonances
in order to reduce their effects. In the case of dampening critical resonances, part of the
energy is destroyed by friction. For instance, heavy fabrics can be hung a few centimeters
from the wall which dampen the reflections. If you want to go a step further, you can
even use special dampening material. In this case we recommend that you use the heavy
fabrics. We can assure you that an area of 1 m (3.3 ft) height and 0.5 m (1.6 ft) width put
on the reflection point may produce astounding results. In the case of diffusing critical
resonances, the sound should be reflected in different ways. A shelf with many books of
different sizes can do the trick. However, you can also buy so-called diffusers, specially
designed for the diffusion of sound waves.
phase
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