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Application Guide - 15
Design Worksheet, EdgeMax EM180 & Mixed EM90/EM180 Systems
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.
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.
Continuous SPL Chart, EM180 & Mixed
Mount
Height
m 2.7 3.0 3.7 4.3 4.9 5.5 6.1 6.7 7.9 9.1
ft 9 10 12 14 16 18 20 22 26 30
TAP
2.5 91 89 86 84 82 80 79 78 76
dB
SPL
5 94 92 89 87 85 83 82 81 79 78
10 97 95 92 90 88 86 85 84 82 81
20 100 98 95 93 91 90 88 87 85 84
40 103 101 98 96 94 93 91 90 88 87
80 106 104 101 99 97 96 94 93 91 90
8 Ohm 108 106 103 101 99 97 96 95 93 92
Number of
Loudspeakers
Required
Loudspeaker Tap
Power
Required
X
=
Power Required
Headroom Amplifier Size
X
=
1.25
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