LF SHAPE
1
2-3
4-5
6-8
CLUSTER SIZE
LOW-FREQUENCY COUPLING EFFECTS
While wave-guides provide isolated control over various mid- to high-frequency coverage areas, the low-frequency section of a NX L23-A
array still requires mutual coupling - with equal amplitude and phase - to achieve better directionality. Low-frequency directionality is less
dependent on the array’s relative splay angles and more dependent on the number of elements of the array.
At low frequencies, the more elements in the array (the longer the array), the more directional the array becomes, providing more SPL in
this range. The directional control of the array is achieved when the length of the array is similar or larger than the wavelength of the frequencies
being reproduced by the array.
LOW-FREQUENCY STRATEGIES
Although the array can (and usually should) be zoned for implementing different equalization curves for high frequencies, identical equalization
should be maintained in all the low-frequency filters.
Different low-frequency equalization settings in the same array will degrade the desired coupling effect. For the same reason, gain differences
are not recommended for line arrays, since adjusting various zones with an overall amplitude control for each results in decrease of Low-
frequency headroom and directionality.
In any case, line arrays generally need a correction to compensate for energy sum on lows.
In the next figure is shown the equalization that corresponds to LF SHAPE settings, referring to different number of speakers from 1 up to
6-8. Increasing the number of cabinets, response curves are decreased in order to compensate the low-frequency section mutual coupling.
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