Bose EdgeMax EM90 Design-Handbuch - Seite 15
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Step 8 (Amplifier Size): Calculate the required amplifier size Use the Tap Chart below to
determine which loudspeaker tap is required for this design
A. Locate the loudspeaker mounting height for this design
B. Draw a line down to the desired maximum SPL
C. Draw a horizontal line across the chart to read the required loudspeaker tap
m
Mount
Height
ft
2.5
5
10
TAP
20
40
80
8 Ohm
D. Calculate the required amplifier power:
E. Calculate the required amplifier size:
NOTE: When working with a mixed EM90 and EM180 system, the EM90 loudspeakers should
be tapped 3 dB less than the EM180 loudspeakers to balance the overall SPL level
Design Worksheet, EdgeMax EM180 & Mixed EM90/EM180 Systems
Continuous SPL Chart, EM180 & Mixed
2.7
3.0
3.7
9
10
12
91
89
86
94
92
89
97
95
92
100
98
95
103
101
98
106
104
101
108
106
103
X
Number of
Loudspeakers
X
Power Required
4.3
4.9
5.5
14
16
18
84
82
80
87
85
83
90
88
86
93
91
90
96
94
93
99
97
96
101
99
97
=
Required
Loudspeaker Tap
=
1.25
Headroom
6.1
6.7
7.9
9.1
20
22
26
30
79
78
76
82
81
79
78
85
84
82
88
87
85
84
91
90
88
87
94
93
91
90
96
95
93
92
Power
Required
Amplifier Size
81
dB
SPL
Design Guide - 15