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Multiple DSAi modules arrayed as a cluster at a single location allows a
greater range of beamwidths, SPL, pattern control, and low frequency
output than a single DSAi module can provide. DSAPilot treats the
cluster as if it were a single loudspeaker, precluding the complexities
normally associated with designing and tuning clusters.
The major advantage of DSAi its radiation pattern which is quite
different than simply angling down a loudspeaker with the same
horizontal and vertical beamwidths. The example EASE plots illustrate
the differences. While the angled loudspeaker is a line array, the
behavior of a conventional horn would be quite similar.
The radiation pattern of the angled loudspeaker has several problems that
would reduce intelligibility. There is inadequate coverage across the front
area of the room and it focuses a distinct line of energy along the front and
side walls at nearly the same loudness as the floor seating area. The energy
reflecting off these surfaces would arrive at many listeners late enough to
impair intelligibility. It would also be reflected around to other surfaces,
energizing the reverberant field and decreasing the direct-to-reverberant
ratio. Some of these reflections add to the direct sound causing the highest
intensity sound to be at the rear, even though further from the loudspeaker.
By contrast, the radiation pattern of the electronically steered DSAi is
far more consistent across the entire floor area. Not only is less energy
directed at the walls, but the reflection pattern would be quite different,
primarily directed down towards floor or to nearby listeners, arriving
early enough to actually enhance intelligibility.
DSAi’s steering algorithms are also designed to provide a smooth off-
axis pattern instead of the distinct and undesirable off-axis lobes
characteristic of line arrays. Such lobes can be seen in the conventional
line array as the V-shaped pattern of spots in front of the stage.
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Figure 4.4a Angled Radiation Pattern
Figure 4.4b DSAi Steered Radiation Pattern
Ver: 30° Hor: 120°
Lspk: S1
Project: DSAMultipurpose-Tilt
Map: Direct SPL
Freq:5000 Hz
[Third Octave Average]
Shadow Cast: No
Resolution = 1.0 m
Ver: 30° Hor: 120°
Lspk: S1
Project: DSAMultipurpose-Steer
Map: Direct SPL
Freq:5000 Hz
[Third Octave Average]
Shadow Cast: No
Resolution = 1.0 m