Martin Audio W8L Longbow Application Manual page 28

Quantity
(splayed at 1°)
1
2
4
6
8
Effective source spl (referred to 1m) – at 1° splay - vs model & quantity
Quantity
(splayed at 2°)
1
2
4
Effective source spl (referred to 1m) – at 2° splay -vs model & quantity
Value of B
Distance from
array
?
(2xLongbow,
16m
32m
64m
128m
256m
Radial attenuation vs line array length & distance at 6KHz
V a l u e o f C
Distance from array
?
16m
32m
64m
128m
256m
Excess air attenuation vs distance at 6KHz (20°C at sea level)
Longbow
Max dB spl
cont. Pk
142 148
148 154
153 159
156 162
158 164
Longbow
Max dB spl
cont. pk
142 148
147 153
151 157
1m 2m
array array
(4xLongbow,
3xW8LC 5xW8LC
or or
4xW8LM) 8xW8LM)
15dB 12dB
21dB 15dB
27dB 21dB
33dB 27dB
39dB 33dB
(inter-cabinet splay = 1° or less)
25% R.H.
2dB
4dB
8dB
16dB
32dB
W8LC
Max dB spl
cont. pk
129 135
135 141
140 146
143 149
145 151
W8LC
Max dB spl
cont. pk
129 135
134 140
138 144
4m
array
array
(8xLongbow,
(12xLongbow
11xW8LC
or
16xW8LC)
16xW8M)
12dB 12dB
15dB 15dB
18dB 18dB
21dB 21dB
27dB 24dB
50% R.H. 75% R.H.
1dB 0.7dB
2dB 1.4dB
4dB 2.8dB
8dB 5.6dB
16dB 11dB
All material © 2007. Martin Audio Ltd. Subject to change without notice.
W8LM
Max dB spl
cont. pk
125 131
131 137
136 142
139 145
141 147
W8LM
Max dB spl
cont. pk
125 131
130 136
134 140
8m
6m
array
(16xLongbow)
or
12dB
15dB
18dB
21dB
24dB
100% R.H.
0.6dB
1.2dB
2.3dB
4.6dB
9.2dB