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FreeSpace
DS 40F
®
Loudspeaker
Design Recommendations
When creating a design that uses FreeSpace
• FreeSpace DS 40F loudspeakers are ideally suited to background and foreground music and
paging applications. If your customer's requirement is for a foreground music system, consider
the FreeSpace DS 100F loudspeaker. For background music systems, consider the FreeSpace
DS 16F loudspeaker.
• Recommended mounting height for the FreeSpace DS 40F loudspeaker is between 8 and 26ft
(2.4 and 8.0m).
• Maximum SPL for a typical application is between 91 and 106 dB-SPL.
• Always add 25% headroom to your amplifier to accommodate various types of program material.
Coverage requirements vary for each application, and the loudspeaker spacing will vary based
on mounting height and listener height. Use the following two steps to calculate the required
loudspeaker spacing distance for your application.
1
Calculate the loudspeaker
throw distance.
Loudspeaker Throw Distance
(Loudspeaker Mounting Height - Listener Height)
Floor
Total system sound pressure level varies based on the mounting height, loudspeaker tap and room
acoustics. For typical applications, use the chart below to determine the total sound pressure level
that will be achieved using the DS 40F loudspeakers.
m
2.4
3.0
Mount
Height
ft
8
10
2.5*
94
91
5
97
94
TAP (W)
10
100
97
20
103
100
40
106
103
*2.5-watt tap available only in 70V mode.
For more detailed information, refer to the FreeSpace DS 40F loudspeaker Design Guide.
6
OF
8
p r o . B o s e . c o m
DS 40F loudspeakers, you should consider the following:
®
2
Calculate the loudspeaker spacing distance by
multiplying the loudspeaker throw distance by
the desired coverage multiplier.
Loudspeaker
Loudspeaker Mounting Heigh
t
Loudspeaker throw distance x Coverage multiplier = Spacing
Listener Height
Seated - 3ft | 1m
Standing - 5ft | 1.5m
___________
(Loudspeaker
throw distance)
DS 40F
3.6
4.2
4.8
12
14
16
89
86
85
92
89
88
95
92
91
98
95
94
101
98
97
Coverage
Multiplier
Premium
Standard
Minimum
X
__________
(Coverage
multiplier)
5.5
6.1
6.7
7.3
18
20
22
83
82
81
86
85
84
89
88
87
92
91
90
95
94
93
2.0
2.5
3.0
=
__________
(Spacing)
8.0
24
26
80
79
83
82
dB-SPL
86
85
89
88
92
91