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DSA250 Design
In the physical design of the DSA250 loudspeakers, engineers broke new ground for EAW in specifying an extruded aluminum enclosure. Several factors made aluminum an excellent choice. In addition to its exceptional strength and rigidity, the use of aluminum allowed the entire enclosure to act as a heat sink, an important consideration for the sixteen internal amplifiers. Heat sink ribs on the rear of the enclosure also act as wire channels for a clean, elegant installation. Molded plastic end caps house all
connectors with AC power on one end and audio signal and network communications on the other. The intelligently designed enclosure allows easy access during installation while cables and connectors remain virtually hidden.
Actual measured performance of prototype and pilot run systems meet expectations and prove out the concepts of vertical beamwidth variability and steerability. Peak output varies between 120 to 130 dB SPL depending on the DSP-controlled vertical beamwidth and steering angle. As a rule, a narrow beam focused straight ahead delivers maximum output with wide beams and sharp coverage angles slightly attenuating peak SPL. Frequency
range response is admirably flat from 100 Hz to 16 kHz.
Of course, most of the testing efforts were focused on the variability and steerability of the vertical beamwidth. Indeed, properly configured DSP can vary a DSA250 loudspeaker’s vertical beamwidth anywhere from 15° to 120°. Furthermore, the beam can be steered ±30° while maintaining even frequency response up to 16 kHz. Beyond those angles, a complex set of variables comes into play. With proper thought and, occasionally, a modest performance compromise, radical steering angles and even intentional nulls can be achieved. In particular, band-limiting the signal to around 8 kHz allows for radical shaping with smooth frequency response across a large area. Interested parties should check the Discussion Forum of the EAW website where, no doubt, many questions about the exciting, new technology will be asked and, hopefully, answered.
DSA230 Design
A DSA230 loudspeaker is simply the low frequency section of a DSA250 housed in a separate enclosure. It includes (8)4-in LF cones as well as 8 channels of power and processing. The addition of a DSA230 effectively doubles the line length of the overall LF section, providing effective directivity to 150 Hz with nominal pattern control maintained to 300 Hz.
Next - DSA Pilot
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Molded plastic end caps house all connectors with AC power in one end and audio signal and network communications on the other. The intelligently designed enclosure allows easy access during installation while cables and connectors remain virtually hidden.
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| Visual representation of the steerability of the vertical beamwidth. Indeed, properly configured DSP can vary a DSA250 loudspeaker’s vertical beamwidth anywhere from 15° to 120°. Furthermore, the beam can be steered ±30° while maintaining even frequency response up to 16 kHz. |
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