User manual

20
ENGLISH
While wave-guides provide isolated control over various mid- to high-frequency coverage areas,
the low-frequency section of a HDL 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.
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 CLUSTER settings, referring
to different number of speakers from 2-3 up to 10-16. Increasing the number of cabinets,
response curves are decreased in order to compensate the low-frequency section mutual
coupling.
HDL loudspeakers can be stacked on top of RCF subwoofers with the dedicated accessories.
HDL 20-A compatible Subwoofers:
- SUB 8004-AS
- SUB 8006-AS
- HDL 18-AS
HDL 10-A compatible Subwoofers:
- SUB 8004-AS
- SUB 8006-AS
- HDL 15-AS
LOW-FREQUENCY COUPLING
EFFECTS
LOW-FREQUENCY STRATEGIES
HDL20-A GROUND
STACKED