JBL VTX B18 Series, User Manual

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VTX B
18 | User Manual
B
18 Compact Single 18” Subwoofer
IN/OUT IN/OUT
A B
Channel Selection
SN
B
18 Compact Single 18” Subwoofer
IN/OUT IN/OUT
A B
Channel Selection
SN
B
18 Compact Single 18” Subwoofer
IN/OUT IN/OUT
A B
Channel Selection
SN
B
18 Compact Single 18” Subwoofer
IN/OUT IN/OUT
A B
Channel Selection
SN
B
18 Compact Single 18” Subwoofer
IN/OUT IN/OUT
A B
Channel Selection
SN
B
18 Compact Single 18” Subwoofer
IN/OUT IN/OUT
A B
Channel Selection
SN
B
18 Compact Single 18” Subwoofer
IN/OUT IN/OUT
A B
Channel Selection
SN
B
18 Compact Single 18” Subwoofer
IN/OUT IN/OUT
A B
Channel Selection
SN
13.2 - EDS EXAMPLE - WITH DELAYS
To improve the coverage of this array (assuming a wider coverage is desirable), the delay calculation function of LAC-3 can be used to
generate delay values for each B18 cluster and electronically alter the coverage of the array. The goal is the electronically curve the array
for a predetermine angle, and “open” the coverage of the array. The SPL map below shows the coverage of the array using the delay
values generated by LAC for an opening angle of 60°. As can be seen, the coverage is wider with more parts of the venue covered by
the array.
The illustration below shows the delay values generated by LAC (for a 60° angle) and the “virtually” arced array based on the delays.
Delay values for different coverage angles and cluster spacing can be generated in LAC. Care should be taken not to over steer an array
and significantly reduce energy on the on-axis positions.
0
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4
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16
18
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0 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88
120
115
110
105
100
95
90
85
80
0ms 0ms 1.0ms 3.2ms 6.7ms 1.0ms 3.2ms 6.7ms
Real Array Virtual Array