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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  

throat section shall be constructed of die-cast zinc and  

shall be integrally laminated into the fiberglass portion  

of the horn.  

The horn shall be of the constant-directivity type.It shall  

produce a horizontal beamwidth (6 dB-down angle) of  

1

20 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 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 of hybrid fiberglass-and-zinc  

construction. The driver-mounting flange and initial  

The horn shall be the Electro-Voice® model HP1240  

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).  

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.  

Horizontal Beamwidth:  

120° (+20°, -40°) (-6 dB 500 Hz to 20 kHz)  

Mechanical Connection of Driver:  

Vertical Beamwidth:  

Bolt on; standard 2" diameter throat, 5" diameter  

mounting flange and four clearance holes for 1/4" bolts  

on a 4" diameter bolt circle.  

40° (+20°, -10°) (-6 dB, 1.5 kHz to 20 kHz)  

Directivity Factor R_θ (Q):  

8

.4 (average 1.25 kHz to 20 kHz)  

Recommended Driver:  

DH1A or DH2A  

Weight:  

Directivity Index D_i:  

9

1

.24 dB (+1.2, -.9 dB)  

0 log R_θ, (average 1.25 kHz to 20 kHz)  

3.2 kg (7.0 lb)  

Lowest Recommended Crossover Frequency:  

500 Hz  

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