HP940
Constant-Directivity
Horn
General Product Description
The Electro-Voice® HP940 is a wide-range, flat-front, constant-directivity, high-frequency horn. With the HP940, a horizontal dispersion angle is controlled over a frequency range of 500 Hz to 20 kHz, and the vertical angle is controlled from 1.2 kHz to 20 kHz, both with unusual precision and adherence to the intended angle. Furthermore, excellent loading is maintained to a low frequency of 500 Hz.
The flat-front design makes the HP940 suitable for all modern boxed and clustered systems. A special vaned waveguide throat detail gives the HP940 unusually uniform vertical directivity control in the top octaves when compared to similar 2-inch-throat horn designs.
Architects’ and Engineers’ Specifications
The horn shall be of the constant-directivity type. It shall produce a horizontal beamwidth (6-dB-down angle) of 90 degrees, deviating no more than 20 degrees from this angle over the frequency range of 500 to 20,000 Hz. It shall produce a vertical beamwidth of 40 degrees, deviating no more than 20 degrees from this angle over the frequency range of 1,200 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 initial throat section shall be
constructed on die-cast zinc and shall be integrally laminated into the fiberglass portion of the horn.
The horn shall possess a throat of 4.92 cm (1.94-in.) diameter, and its flange shall be provided with four clearance holes for 1/4-20 bolts, located on a 10.2 cm (4.0 in.) circle for the mounting of the compression driver. The horn shall be 33.0 cm (13.0 in.) high, 53.3 cm (21.0 in.) wide and 28.4 cm (11.2 in.) long. It shall weigh no more than 3.2 kg (7.0 lb).
The horn shall be the Electro-Voice HP940 constant-directivity horn.
Specifications:
The following specifications are in accordance with or exceed the AES Recommended Practice for Specification of Loudspeaker Components Used in Professional Audio and Sound Reinforcement (AES2-1984; ANSI S4.26-1984).
Horizontal Beamwidth:
90° (+20°, -10°) (-6 dB 500 Hz to 20 kHz)
Vertical Beamwidth:
40° (+20°, -10°) (-6 dB, 1.2 kHz to 20 kHz)
Directivity Factor Rθ (Q):
11.8 (average 1.25 kHz to 16 kHz)
Directivity Index Di:
10.7 dB (+1.2, -1.3 dB)
10 log Rθ, (average 1.25 kHz to 16 kHz)
Lowest Recommended Crossover Frequency:
Construction:
Polyester resin and glass-fiber laminate integrally molded to a die-cast zinc throat section. This hybrid construction assures a rigid driver mount, accurate, loss-free throat-wave transmission and low total weight compared to horns of similar size.
Mechanical Connection of Driver:
Bolt on; standard 2" diameter throat, 5" diameter mounting flange and four clearance holes for ¼" bolts on a 4" diameter bolt circle.
Recommended Driver:
DH1A or DH2A
Weight:
3.2 kg (7.0 lb)
500 Hz
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