6
OTHER POINTS TO PAY ATTENTION TO:
While mounting a column speaker, there are still some other points where has to be
paid attention to.
- Make sure that the loudspeaker array is always visible for everyone in the listening
area, to ensure a good audibility of the high tones. High tones can be compared with
light. When something is between the observer and the light source, the observer can’t
see the light source at it’s full power, this is what we call shadow.
For high tones, this is the same issue. When someone is standing between the listener
and the loudspeaker, the listener is located in the sound shadow. The sound shadow
will be experienced as a reduction of high tones.
- When the loudspeaker is installed at a very small angle, a large listening area can be
reached. Depending on the amount of reverberation in the room and the sound
shadow, the speech intelligibility on a far position may be low. In this situation, it is
recommended to use more loudspeaker arrays to split the listening area.
- When you move further than the maximum position of the listening area, only the
sound pressure level will decrease. There will be almost no tone height variation. The
decreasing factor of the sound pressure level depends strongly on the reverberation of
the room.
- When you are located too close to the loudspeaker array (closer than the minimum
distance, approximately 5 times the length of the speaker ) a decline of the high tones
will occur very soon.
- Because the loudspeakers are designed to beam the sound just above the listeners
ears, it’s better to mount the speakers not to high above the listening area.
- When you want to determine where exactly the edges of the listening area are located
in your situation, you have to do a practical test at this location. This is a job for an
experienced listener with well-trained ears. Put pink noise through the loudspeaker
array, and reduce the lower tones for this test because they do not contribute to speech
intelligibility. Walk around in the listening area and pay attention to the high tones. The
places where the high tones decrease rapidly are the edges of the listening area.
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