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Dispersion Angle distance for same coverage
Inverse Square law (point source)
- 22 db
- 28 dB
- 34 dB
- 37.5 dB
- 40 dB
B
(246.1 ft)
12.5m
25m
50m
75m
100m
(41.01’)
(82.02’)
(164’)
(246.1’)
(328.1’)
This graph should help you to get a feeling of coverage angles, loss in SPL and covered areas.
The following questions can be answered:
1.
Question: “What coverage angle is needed to cover a width of X meters by the maximum possible distance to the audience
of Y meters?” Helpful when the install position of the speakers and the area to cover are predetermined.
Solution: Possible distance to the audience is a maximum of 12 meters. Covered width should be approx. 36 meters
(2 x 18 meters). A system that provides 120 degrees coverage is needed.
2.
Question: “Which system is needed when the distance to the audience and the target SPL is known?” Helpful when the
install position of the speakers is known and a pre-defined SPL is required.
Solution: Inverse square law of a point source (-6dB when doubling the distance) helps to define the loss in SPL at a distance
of X meters. The pre-determined SPL at listening level (the audience) should be 100 dB. Distance to the speaker is approx. 50
meters (I.E. open-air, arena etc). The loss in SPL after 50 meters is approx. 33 dB, therefore the system has to provide a
continuous SPL of 133 dB/1m.
3.
Question: “At what distance is a (i.e.) 75 meters width reached, using different loudspeakers with different coverage angles?
Solution: A 120 degrees system provides a covered width of 75 meters after approx. 22 meters. A 40 degree system provides
same width after approx. 100 meters.
4.
Furthermore (based on point 3): “What´s the loss of SPL in both cases?”
Solution: Approx. 25 dB for the 120 degrees and approx. 40 dB for the 40 degrees system. To achieve a pre-determined SPL of
105 dB, when an area of 75 meters needs to be covered, the 120 degrees system has to deliver > 130 dB and the 40 degrees
system > 145 dB. In explanation: A job for MH 4020 which provides 146 dB maximum.
5.
And others…
Dispersion angle versus distance for same coverage
Inverse squar
e law (point sour
ce)
Speaker, Distances and Horns