Electro Voice Speaker System HPT64 User Manual

HPT64  
Constant-Directivity  
Supertweeter Horn  
General Product Description  
The Electro-Voice® model HPT64 is a wide-range, flat-  
front, constant-directivity super-tweeter horn. Both  
horizontal and vertical angles are controlled from 3 kHz  
to 20 kHz with unusual precision and adherence to the  
intended angle. Furthermore, excellent loading is  
maintained to 1,600 Hz. The flat-front design makes  
the HPT64 suitable for all modern boxed and clustered  
systems.  
Architects’ and Engineers’ Specifications  
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 3 kHz to 20 kHz. It  
shall produce a vertical beamwidth of 40 degrees,  
deviating no more than 20 degrees from this angle over  
the frequency range 3 kHz to 20 kHz. In addition, it  
shall provide useful acoustic loading at all frequencies  
above 1.6 kHz.  
laminated into the fiberglass portion of the horn.  
The horn shall possess a throat of 2.36 cm (0.93in.)  
diameter and shall be provided with a 1-3/8"-18  
threaded hole for the mounting of a compression driver.  
The horn shall be 13.3 cm (5.3 in.) high, 13.3 cm (5.3  
in.) wide, and 10.4 cm (4.1 in.) long. It shall weigh no  
more than 1.8 kg (4.0 lb).  
The horn shall be of hybrid fiberglass-and-zinc  
construction. The initial throat section shall be  
constructed of die-cast zinc and shall be integrally  
The horn shall be the Electro-Voice model HPT64  
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:  
60° (+20°, -10°) - (-6 dB 3 kHz to 20 kHz)  
Vertical Beamwidth:  
Mechanical Connection of Driver:  
1-3/8"-18 thread allows the attachment of the DH2010A  
or DH2T drivers  
40° (+20°, -10°) - (-6 dB, 4 kHz to 20 kHz)  
Directivity Factor Rθ (Q):  
Recommended Driver:  
DH2010A or DH2T  
Weight:  
15.8 (average 3 kHz to 20 kHz)  
Directivity Index Di:  
1.8 kg (4.0 lb)  
12.0 dB (+1.2, -1.6 dB)  
10 log Rθ, (average 3 kHz to 20 kHz)  
Lowest Recommended Crossover Frequency:  
1.6 kHz  
 

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