Detailed instructions for use are in the User's Guide.
[. . . ] Furthermore, excellent loading is maintained to a low frequency of 500 Hz. The flat-front design makes the HP420 suitable for all modern boxed and clustered systems. [. . . ] A special vaned waveguide throat detail gives the HP420 unusually good high-frequency control, vertically, when compared to similar 2-inch-throat horn designs.
Constant-Directivity Horn
Architects' and Engineers' Specifications
The horn shall be of the constant-directivity type. It shall produce a horizontal beamwidth (6 dB-down angle) of 40 degrees, deviating no more that 20 degrees from this angle over the frequency range 650 to 20, 000 Hz. It shall produce a vertical beamwidth of 20 degrees, deviating no more than 10 degrees from this angle over the frequency range 2, 200 to 20, 000 Hz. In addition, it shall provide useful acoustic loading at all frequencies above 500 Hz. The horn shall be of hybrid fiberglass-and-zinc construction. The horizontal beamwidth is maintained at 40° (+20°, -10°) over the range of 650 Hz to 20 kHz. Vertical beamwidth control occurs only above 2. 2 kHz because of the relatively short vertical dimension of the horn's mouth.
Figure 2: Directivity vesus Frequency
Figure 3: 6-dB-Down Beamwidth versus Frequency
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