Electro-Voice Constant-Directivity Horn HP1240 User manual

HP1240
Constant-Directivity
Horn
General Product Description
The Electro-Voice®model HP1240 is a wide-range,
flat-front, high-frequency, constant directivity horn. The
horizontal angle is controlled over a frequency range
of 500 Hz to 20 kHz and the vertical angle is controlled
from 1.5 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 HP1240 suitable for all
modern boxed and clustered systems. A special vaned
waveguide throat detail gives the HP1240 unusually
good high-frequency control, vertically, 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
120 degrees, deviating no more that 40 degrees from
this angle over the frequency range 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 1,500 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 driver-mounting flange and initial
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:
120° (+20°, -40°) (-6 dB 500 Hz to 20 kHz)
Vertical Beamwidth:
40° (+20°, -10°) (-6 dB, 1.5 kHz to 20 kHz)
Directivity Factor Rθ(Q):
8.4 (average 1.25 kHz to 20 kHz)
Directivity Index Di:
9.24 dB (+1.2, -.9 dB)
10 log Rθ, (average 1.25 kHz to 20 kHz)
Lowest Recommended Crossover Frequency:
500 Hz
throat section shall be constructed of 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 (1.94in.)
diameter and its flange shall be provided with four ¼-20
clearance bolt holes 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
26.4 cm (10.4 in.) long. It shall weigh no more than 3.2
kg (7.0 lb).
The horn shall be the Electro-Voice® model HP1240
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 1/4" bolts
on a 4" diameter bolt circle.
Recommended Driver:
DH1A or DH2A
Weight:
3.2 kg (7.0 lb)

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Directivity
The axial directivity factor Rθ(formerly Q) of the HP1240 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 HP1240 with a particular driver is in close
correspondence to that driver’s power response above 500
Hz.
Beamwidth
A plot of the HP1240’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 120°
(+20°, -40°) over the range of 500 Hz to 20 kHz. Vertical
beamwidth control occurs only above 1.5 kHz because of
the relatively short vertical dimension of the horn’s mouth.
Figure 3: 6-dB-Down Beamwidth versus FrequencyFigure 2: Directivity vesus Frequency
Figure 1: Dimensions
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.
© Telex Communications, Inc. 02/2001
Part Number 38109-951 Rev A
USA 12000 Portlan Ave South, Burnsville, MN 55337, Phone: [phone], FAX: [phone]
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Germany Hirschberger Ring 45, D94315, Straubing, Germany, Phone: [phone], FAX: [phone]
France Parc e Courcerin, Alle Lech Walesa, Lognes, 77185 Marne La Vallee, France, Phone: [phone], FAX: [phone]
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