Electro Voice Speaker System HP66 User Manual

HP66  
TransPlanar™  
Constant-Directivity  
Horn  
General Product Description  
The Electro-Voice® HP66 is a wide-range, flat-front,  
constant-directivity, high-frequency horn. With the  
HP66, a horizontal dispersion angle is controlled over  
a frequency range of 1.6 kHz to 20 kHz, and the vertical  
angle is controlled from 1.25 kHz to 20 kHz, both with  
unusual precision and adherence to the intended angle.  
Furthermore, excellent loading is maintained to a low  
frequency of 1000 Hz.  
The flat-front TransPlanar™ design makes the HP66  
suitable for all modern boxed and clustered systems.A  
special vaned waveguide throat detail gives the HP66  
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  
60 degrees, deviating no more than 20 degrees from  
this angle over the frequency range of 1,600 to 20,000  
Hz.It shall produce a vertical beamwidth of 60 degrees,  
deviating no more than 20 degrees from this angle over  
the frequency range of 1,250 to 20,000 Hz.In addition,  
it shall provide useful acoustic loading at all frequencies  
above 1000 Hz.  
The horn shall possess a throat of 4.93-cm (1.94-in.)  
diameter, and its flange shall be provided with four  
clearance holes for ¼-20 bolts, located on a 10.2-cm  
(4.0-in.) circle for the mounting of the compression  
driver. The horn shall be 27.9 cm (11.0 in.) high, 22.4  
cm (8.8 in.) wide and 16.5 cm (6.5 in.) long. It shall  
weigh no more than 2.2 kg (4.8 lb).  
The horn shall be the Electro-Voice HP66  
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:  
60° (+20°, -10°) (-6 dB 1.6 kHz 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, 1.25 kHz to 20 kHz)  
Directivity Factor Rθ (Q):  
Recommended Driver:  
DH1A, DH2A, DH2As2  
Weight:  
17.8 (average 1.6 kHz to 20 kHz)  
Directivity Index Di:  
12.5 dB (+2.0, -3.0 dB)  
10 log Rθ, (average 1.6 kHz to 20 kHz)  
2.2 kg (4.8 lb)  
Lowest Recommended Crossover Frequency:  
1000 Hz  
 

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