Bedienungsanleitung Bose FreeSpace 4400 (Seite 7 von 70) (Englisch)

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2.0 Designing with the FreeSpace

4400 System

2.1 Introduction

This section describes the basic steps for designing a FreeSpace

4400 system and includes an example. It is assumed that a com-

plete loudspeaker design and layout has already been created.

2.2 Basic design steps

There are five basic steps in designing a FreeSpace 4400 system.

2.2.1 Step 1 – Determine source routing

Decide which sources will be played in each area. Create a

“source map” such as the following one that shows which

sources will be played in each major area of the facility.

2.2.2 Step 2 – Determine Auto Volume

requirements

Identify which areas will use Auto Volume. Each Auto Volume

zone must use one AVM (Auto Volume) user interface and one

Bose

sensing microphone to control the volume.

When using Auto Volume, remember that you will be adjusting

the volume of an overall area. Imagine that you have a dining area

and a bar adjacent to one another. If the sensing microphone is

placed above the bar, the music may become too loud in the din

ing area. Likewise, if you place the sensing microphone above

the dining area, the music may never be heard in the bar.

Guidelines for establishing Auto Volume zones

Loudspeaker mounting height and the overall quality of the back-

ground noise is used to determine the Auto Volume zoning

requirements. Uniform background noise is found in an area

where no part of the area is louder or quieter than any other. A

room with non-uniform background noise would seem louder in

some areas (people talking, machinery running, etc.) and quieter

in others.

Mounting guidelines for sensing microphones

• The sensing microphone must be mounted at the same height

as the loudspeakers or higher. A sensing microphone must

never be mounted lower than the loudspeaker height.

• In all cases, there must be 6 ft (1.8 m), minimum, between the

loudspeaker and the sensing microphone. This is so that the

microphone does not receive signals only from a loudspeaker.

• There must be 35 ft (10.7 m), minimum, between the sensing

microphones of two adjacent Auto Volume zones.

• Avoid placing the microphone near unique noise sources like

HVAC equipment, dishwashers, motors, etc.

Separating the microphones as much as possible for two zones

is the best practice. Consider the previous example of the dining

area and a bar adjacent to one another. If each of these areas

uses Auto Volume, it is possible to create a situation in the dining

area where the music is too loud simply because the microphone

is too close to the bar.

Source 1 Source 2 Source 3 Source 4

Area 1 ● ●

Area 2 ● ● ●

Area 3 ● ●

Area 4 ●

Area 5 ●

Loudspeaker

height is…

Background noise

is uniform

Background noise

is non-uniform

>25 ft (7.6 m) Not recommended

12-25 ft

(3.7-7.6 m)

One Auto Volume

zone for every

3600 ft

(324 m

)

One Auto Volume

zone for every

1800 ft

(162 m

)

<12 ft (3.7 m) One Auto Volume

zone for every

1800 ft

(162 m

)

One Auto Volume

zone for every

900 ft

(81 m

)

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