Electro-Voice Constant-Directivity Horn HP940 User manual

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
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:
500 Hz
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.
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)

U.S.A. and Canada only.
For customer orders, contact the Customer Service department at
800/392 3497 Fax: [phone]
For warranty repair or service information, contact the Service
Repair department at 800/685 2606
For technical assistance, contact Technical Support at 866/78AUDIO
Please refer to the Engineering Data Sheet for warranty information.
Specifications subject to change without notice.
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Directivity
The axial directivity factor Rθ, (formerly Q) of the HP940 horn
was computed at each one-third-octave center frequency from
the horizontal/vertical polars. The graph in Figure 2 illustrates
this data over the range 500 Hz to 20 kHz.The axial frequency
response of the HP940 with a particular driver is in close
correspondence to that driver’s power response above 500
Hz.
Figure 3: 6-dB-Down Beamwidth versus FrequencyFigure 2: Directivity vesus Frequency
Figure 1: Dimensions
Beamwidth
A plot of the HP940’s 6-dB-down total included beamwidth
angle is shown in Figure 3 for each one-third-octave center
frequency. The horizontal beamwidth is maintained at 90°
(+20°, -10°) over the range 500 Hz to 20 kHz. Vertical
beamwidth control occurs only above 1.2 kHz because of
the relatively short vertical dimension of the horn’s mouth.
© Telex Communications, Inc. 02/2001
Part Number 38109-963 Rev A
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