Bose EdgeMax EM90 Manuel de conception - Page 8

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Bose EdgeMax EM90 Manuel de conception
EdgeMax Design Considerations
When working with rectangular-shaped coverage areas it is possible to exceed the Maximum
Room Dimension in one dimension, either length or width, but not both In this case the design
is treated as any other surface-mounted system design by spacing the EdgeMax loudspeakers
along the perimeter using a spacing constant based on the mounting height, and desired
coverage quality
EM
180
0.5 x
Loudspeaker
Spacing
EM
180
The spacing constant is the Loudspeaker Spacing Distance This distance is based on
the vertical coverage angle of the EdgeMax loudspeakers for both premium and standard
coverage types, and is calculated based on the ceiling height where the loudspeakers will be
installed
Mounting Height
Coverage
Quality
Figure 12. Loudspeaker Spacing Distance table for various ceiling heights and coverage quality.
Assumes 1.5 m (5') ear height.

Balancing SPL In Mixed EM90 and EM180 Systems

EdgeMax loudspeakers are available in two horizontal coverage models, 90 and 180-degree
(EM90 and EM180, respectfully) The difference in horizontal coverage results in a 3 dB
sensitivity difference between the two devices, with the EM180 being 3 dB less sensitive than
the EM90 model
When designing a system that will mix both EdgeMax EM90 and EM180 loudspeakers, you will
need to set the power level to the EM90 loudspeakers 3 dB less than the EM180 loudspeakers
to achieve equivalent loudness In 70/100V constant voltage applications, this can be easily
achieved by setting your EM90 loudspeakers one tap setting lower then the EM180s in the
same room
Design Guide - 8
180
Loudspeaker Spacing Distance
180
Variable Room Dimension
Loudspeaker Spacing Distance, EdgeMax EM180
Premium
Standard
EM
EM
m
2 7
3 0
3 7
ft
9
10
12
m
3
4
6
ft
11
15
20
m
7
9
12
ft
20
30
40
Figure 11. The room size can
exceed the Maximum Room
Dimension in one dimension,
length or width, to create a
distributed design along the
perimeter of the room.
4 3
4 9
5 5
14
16
18
8
9
11
25
30
35
12
12
12
40
40
40
6 1
20
13
40
12
40