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Chapter 4 Description
4.1 System Overview
DSA Series loudspeakers are variable directivity, self-powered line arrays. Each
loudspeaker’s vertical beamwidth is determined by the settings of an internal
DSP (digital signal processor) and power amplifier for each transducer. This
provides complete, on-site control over the range of possible vertical
beamwidth patterns.
EAW’s Windows-based DSAPilot is used to set the coverage required for each
loudspeaker or loudspeaker cluster. The user-friendly DSAPilot optimizes the
required signal processing for the design. This data is then uploaded to the DSA
Series loudspeakers in the system. The DSAPilot normally communicates with the
loudspeakers using EIA-485*. An optional CobraNet™ network interface is available.
*Formerly known as RS-485 (Recommended Standard 485)
4.1.1 DSA SERIES MODELS
DSA250: Full range, 2-way, loudspeaker system
DSA230: Low frequency and voice-only loudspeaker system
4.1.2 ACOUSTICAL BENEFITS
Each loudspeaker can be electronically adjusted on-site to direct sound
primarily where needed. Unwanted sound reflections from room
surfaces can be reduced, improving the direct to reverberant sound
ratio. This, in turn, can significantly increase speech intelligibility.
Asymmetrical pattern control can provide consistent SPL in situations
with HIGH near-to-far listener distance ratios. User adjustable level
control, equalization, and compression, are provided on each of the
two audio inputs. For situations with multiple locations, overall signal
delay for each loudspeaker cluster is also provided.
4.1.3 PHYSICAL BENEFITS
The DSA Series loudspeakers are physically narrow and quite shallow,
providing a low profile to reduce their impact on architecture. Their
normal mounting position is specifically designed to be flat against a
vertical surface. This considerably reduces installation complexity. The
DSA Series design permits several loudspeakers to be easily arrayed in
one location as a cluster. This affords additional capabilities including
higher output and extremely narrow vertical coverage, as well as extended
pattern control, and output at lower frequencies.
DSA Series enclosures are constructed of a powder-coated, extruded
aluminum body (also used as the amplifier heat sink), high-impact
polystyrene end caps, a thick PVC baffle, and a finely perforated
steel grille. This construction is designed for years of trouble-free
use. The appearance is designed to blend attractively with a variety
of architecture. The enclosure finish is a neutral white. The grille is
powder-coated steel, with a perforation style that appears similar to a
cloth grille at typical in-use distances. Installation hardware is included to
facilitate installation in most applications.
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Figure 4.1.1 DSA250 & DSA230