Installation questions and answers:
–
May I install the LBC3200 loudspeaker array the same as LBC3210 or LBC3201?
–
This loudspeaker array is designed for small and medium indoor environments. The
optimal acoustical performance of this loudspeaker array is obtained by beaming the
sound just above the listeners’ heads. When this loudspeaker array is mounted as the
LBC3210 or LBC3201, a very small listening area results. This is also the reason for not
using an angle greater than 6º.
–
If I cannot see the loudspeaker array, does it mean that I cannot hear high tones?
–
You can compare high tones with light. When something is between you and the light
source, you do not see the light source with its full power. We call this shadow. When a
lot of people are sitting between you and the loudspeaker, you are sitting in the sound
shadow. We experience that as a reduction of high tones.
Background information:
–
Because of the many installing angles it is difficult to give a defined shape of the radiated
sound from the loudspeaker array.
–
By installing the loudspeaker array at a small angle, a (very) large listening area can be
reached. Depending on the amount of reverberation in the room and the sound shadow
(people or objects in front of a listener who are blocking the direct sound source) the
speech intelligibility on a far position may be low. In these situations, it is better to use
more loudspeaker arrays to split the listening area.
–
When you move further than the maximum position of the listening area (more than the
maximum distance from the loudspeaker array), only the sound pressure level will
decrease. There is almost no tone height variation. The decreasing of sound pressure
level depends strongly on the reverberation in the room.
–
When you are too close to the loudspeaker array (less than the minimum distance from
the loudspeaker array) and are using the 5º approach a decline of the high tones will very
soon occur.
–
Because the loudspeakers are designed to beam the sound just above the listeners’
heads, it is better not to mount the loudspeakers too high above the listening area.
–
To determine exactly where the edges of the listening area are in your situation, you have
to carry out a practical test at the location where the loudspeaker array is installed. This
is a job for an experienced listener with well-trained ears. To do so, put pink noise
through the loudspeaker array. It is better to reduce the lower tones for this test, as they
do not contribute to speech intelligibility. Walk around in the listening area and listen to
the high tones. The places where the high tones decrease rapidly are the edges of the
listening area.
XLA 3200 Line Array Loudspeakers
Listening area and related mounting height for XLA3200/00 | en
9
Bosch Security Systems
Product information and installation manual,
please see www.boschsecurity.com
2017.01 | |
