Electro-Voice 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.
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
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).
Horizontal Beamwidth:
60° (+20°, -10°) - (-6 dB 3 kHz to 20 kHz)
Vertical Beamwidth:
40° (+20°, -10°) - (-6 dB, 4 kHz to 20 kHz)
Directivity Factor Rθ(Q):
15.8 (average 3 kHz to 20 kHz)
Directivity Index Di:
12.0 dB (+1.2, -1.6 dB)
10 log Rθ, (average 3 kHz to 20 kHz)
Lowest Recommended Crossover Frequency:
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 the Electro-Voice model HPT64
constant-directivity horn.
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.
Mechanical Connection of Driver:
1-3/8"-18 thread allows the attachment of the DH2010A
or DH2T drivers
Recommended Driver:
DH2010A or DH2T
Weight:
1.8 kg (4.0 lb)

U.S.A. and Canada only.
For customer orders, contact the Customer Service department at
800/392 3497 Fax: [phone]
For warranty repair or service information, contact the Service
Repair department at 800/685 2606
For technical assistance, contact Technical Support at 866/78AUDIO
Please refer to the Engineering Data Sheet for warranty information.
Specifications subject to change without notice.
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Directivity
The axial directivity factor Rθ. (formerly Q) of the HPT64 horn
was computed at each one-third-octave center frequency from
the horizontal/vertical polars.The graph in Figure 2 illustrates
this data over the range 3 kHz to 20 kHz.The axial frequency
response of the HPT64 horn with a particular driver is in close
correspondence to that driver’s power response above 3 kHz.
Beamwidth
A plot of the HPT64’s 6-dB-down total included beamwidth
angle is shown in Figure 3 for each one-third-octave center
frequency. The horizontal beamwidth is maintained at 60°
(+20°, -10°) over the range of 3 kHz to 20 kHz. Vertical
beamwidth control occurs only above 4 kHz.
Figure 3: 6-dB-Down Beamwidth versus FrequencyFigure 2: Directivity vesus Frequency
Figure 1: Dimensions
© Telex Communications, Inc. 02/2001
Part Number 38109-969 Rev A
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