Manual de instrucciones Electro-Voice Constant-Directivity Horn HP1240

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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 Rθ (Q):  
8
.4 (average 1.25 kHz to 20 kHz)  
Recommended Driver:  
DH1A or DH2A  
Weight:  
Directivity Index Di:  
9
1
.24 dB (+1.2, -.9 dB)  
0 log Rθ, (average 1.25 kHz to 20 kHz)  
3.2 kg (7.0 lb)  
Lowest Recommended Crossover Frequency:  
500 Hz  

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