Detailed instructions for use are in the User's Guide.
[. . . ] Furthermore, excellent loading is maintained to 1, 600 Hz. The flat-front design makes the HPT94 EDS suitable for all modern boxed and clustered systems.
Architects' and Engineers' Specifications
The horn shall be of the constant-directivity type. [. . . ] It shall produce a horizontal beamwidth (6-dB-down angle) of 60 degrees, deviating no more than 20 degrees from this angle over the frequency range 3 kHz to 20 kHz. It shall produce a vertical beamwidth of 40 degrees, deviating no more than 20 degrees from this angle over the frequency range 3 kHz to 20 kHz. In addition, it shall provide useful acoustic loading at all frequencies above 1. 6 kHz. The horn shall be of hybrid fiberglass-and-zinc construction. The initial throat section shall be constructed of die-cast zinc and shall be integrally
laminated into the fiberglass portion of the horn. The horizontal beamwidth is maintained at 60° (+20°, -10°) over the range of 3 kHz to 20 kHz. Vertical beamwidth control occurs only above 4 kHz.
Figure 2: Directivity vesus Frequency
Figure 3: 6-dB-Down Beamwidth versus Frequency
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