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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
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 be of hybrid fiberglass-and-zinc
construction. The initial throat section shall be
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 1.6 kHz to 20 kHz)
Vertical Beamwidth:
40° (+20°, -10°) (-6 dB, 1.25 kHz to 20 kHz)
Directivity Factor R
θ
(Q):
17.8 (average 1.6 kHz to 20 kHz)
Directivity Index D
i
:
12.5 dB (+2.0, -3.0 dB)
10 log R
θ
, (average 1.6 kHz to 20 kHz)
Lowest Recommended Crossover Frequency:
1000 Hz
constructed on die-cast zinc and shall be integrally
laminated into the fiberglass portion of the horn.
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.
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:
Bolt on; standard 2" diameter throat, 5" diameter
mounting flange and four clearance holes for ¼" bolts
on a 4" diameter bolt circle.
Recommended Driver:
DH1A, DH2A, DH2As2
Weight:
2.2 kg (4.8 lb)