RCF HDL10-A 1400W Dual 8" Active Line Array Module (Black) - Manual (Page 14)

14
ENGLISH
HDL allow users to choose from different face-to-face angle adjustments to create arrays
with varying curvature. Thus, designers can create arrays custom-tailored to each venue’s
profile.
The basic approach to array design dependent on three factors:
- Number of Array Elements;
- Vertical Splay Angles;
- Horizontal Coverage.
Determining the number of elements to use is critical: the number of elements greatly
affects the SPL available from the system as well as the uniformity of coverage in both SPL
and frequency response. The number of elements profoundly effects the directivity at lower
frequencies.
The next easy equation, works as an approximation for flat listening planes.
Coverage (x) ≈ 8n (m) Coverage distance required = x (metres).
Changing the splay angles between cabinets has a significant impact on vertical coverage
for the high frequencies, with the result that narrower vertical splay angles produce a
higher Q vertical beamwidth, while wider splay lowers the Q at high frequencies. In general,
the splay angles do not affect the vertical coverage at lower frequencies.
The curved array system design can be summarized as:
- flat-front HDL for long throw sections;
- increase curvature as distance decreases;
- add more enclosures for more output.
This approach focuses more transducers mounted on long-throw horns at the farthest seat,
gradually focusing fewer transducers as distance decreases. As long as the no gap rule is
maintained, arrays constructed according to these principles will provide even SPL and a
consistent sonic character throughout the venue without requiring complex processing.
This approach, where the same amount of acoustic energy is spread over a larger or smaller
vertical angle depending on required throw, typically have the following objectives:
- even horizontal and vertical coverage;
- uniform SPL;
- uniform frequency response;
- sufficient SPL for the application.
This discussion represents, of course, just a basic approach. Given the infinite variety of
venues and performers, users will find themselves needing to solve specific problems in
specific situations. RCF Shape Designer software designed to help calculate optimum splay
angles, aiming angles, and fly-bar pick points (crucial in aiming the array) for a given venue,
will be explained later in this Guide.
ARRAY SYSTEMS
DESIGN