Electro Voice Automobile Accessories 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  
constructed on 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  
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 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.  
The horn shall be of hybrid fiberglass-and-zinc  
construction. The initial throat section shall be  
Specifications:  
Construction:  
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).  
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:  
Mechanical Connection of Driver:  
90° (+20°, -10°) (-6 dB 500 Hz to 20 kHz)  
Vertical Beamwidth:  
Bolt on; standard 2" diameter throat, 5" diameter  
mounting flange and four clearance holes for ¼" bolts  
on a 4" diameter bolt circle.  
40° (+20°, -10°) (-6 dB, 1.2 kHz to 20 kHz)  
Directivity Factor Rθ (Q):  
Recommended Driver:  
DH1A or DH2A  
Weight:  
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)  
3.2 kg (7.0 lb)  
Lowest Recommended Crossover Frequency:  
500 Hz  
 

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