Bosch LBC 3200/00 Bedienungsanleitung

XLA 3200 Line Array Loudspeakers

LBC 3200/00, LBC 3201/00, LBC 3210/00

en Product information and installation manual, please see

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Table of contents

1Installation 4

2Listening area and related mounting height for XLA3200/00 8

3Listening area and related mounting height for XLA3201/00 11

4Listening area and related mounting height for XLA3210/00 14

5Technical data 17

5.1 Additional technical data 20

XLA 3200 Line Array Loudspeakers Table of Contents | en 3

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Installation

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Listening area and related mounting height for

XLA3200/00

Determining mounting height and angle for the LBC3200 loudspeaker array:

1. Determine the dimensions of the desired ‘listening area’ (a horizontal plane at the level of

the listeners’ ears – refer to the dashed line in figure 1).

2. Determine the angle at which the loudspeaker array is to be mounted. The array is

designed to beam sound just above the listeners’ heads, and it is recommended not to

exceed an angle of 6”. There are two approaches, each with specific pros and cons.

– Approach 1: Maximized listening area

– When a large listening area is desired, an angle of around 3” is recommended (see figure

1). Note that when walking away from the loudspeaker array, the sound pressure level

will decrease by an amount that depends on the room reverberation. To hear high tones

clearly, the listener should be able to see the loudspeaker array.

– Approach 2: Minimized sound pressure level variation

– When less sound pressure level variation is desired, an angle of 5º is recommended. Note

that this reduces the size of the total listening area compared to approach 1, and that the

space very close to the loudspeaker array (‘A’ in figure 2) is not part of the listening area.

Diagram 1 shows the relationship between ‘A’ and the mounting height of the

loudspeaker array when using a 5” installation angle.

1. After selecting the most appropriate approach (mounting angle), the mounting height of

the loudspeaker is determined by focusing the 0º-axis of the loudspeaker array to the

desired position just above ear level of the furthest listener. This can be adjusted by

mounting the loudspeaker higher or lower on the wall.

Now you can mount the loudspeaker array for optimal acoustic performance.

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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

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2017.01 | |

Figure 1: side view of loudspeaker array radiation mounted to the wall with a small angle

Figure 2: side view of loudspeaker array radiation mounted to the wall with a 5º angle

Diagram 1: relation between listening area distance and loudspeaker array

10 en | Listening area and related mounting height for XLA3200/00 XLA 3200 Line Array Loudspeakers

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