Electro Voice Transplanar Constant Directivity Horn Hp94 Users Manual HP94.p65

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HP94
TransPlanar™
Constant-Directivity
Horn

General Product Description
The Electro-Voice® model HP94 is a wide-range,
flat-front, high-frequency, constant-directivity horn. The
horizontal angle is controlled over a frequency range
of 1.2 kHz to 20 kHz and the vertical angle is controlled
from 2.1 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 design makes the HP94 suitable for all
modern boxed and clustered systems. A special vaned
waveguide throat detail gives the HP94 unusually good
high-frequency control, vertically, 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
90 degrees, deviating no more that 30 degrees from
this angle over the frequency range 1,200 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 2,100 to 20,000 Hz. In addition, it
shall provide useful acoustic loading at all frequencies
above 1000 Hz.

shall be integrally laminated into the fiberglass portion
of the horn.

The horn shall be of hybrid fiberglass-and-zinc
construction. The driver-mounting flange and initial
throat section shall be constructed of die-cast zinc and

The horn shall be the Electro-Voice model HP94
constant-directivity horn.

The horn shall possess a throat of 4.92-cm (1.94in.)
diameter and its flange shall be provided with four ¼-20
clearance bolt holes 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, 22.2 cm (8.8 in.) wide, and
22.2 cm (8.7 in.) long. It shall weigh no more than 2.5
kg (4.5 lb).

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:

90° (+30°, -10°) (-6 dB 1.2 kHz to 20 kHz)
Vertical Beamwidth:

40° (+20°, -10°) (-6 dB, 2.1 kHz to 20 kHz)
Directivity Factor Rθ (Q):

18.1 (average 1.6 kHz to 20 kHz)
Directivity Index Di:

10.1 dB (+1.9, -0.9 dB)
10 log Rθ, (average 1.6 kHz to 20 kHz)
Lowest Recommended Crossover Frequency:

1000 Hz

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
Weight:

2.5 kg (4.5 lb)

Dimensions:

Inches

A

1.938

B

5.00

C

8.75

D

11.00

E

4.00

F

0.281 x 4

G

8.68

H

8.49
Figure 1: Dimensions

Directivity

Beamwidth

The axial directivity factor Rθ. (formerly Q) of the HP94 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 630 Hz to 20 kHz. The axial frequency
response of the HP94 with a particular driver is in close
correspondence to that driver’s power response above 1.6
kHz.

A plot of the HP94’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 90°
(+30°, -10°) over the range of 1.2 kHz to 20 kHz. Vertical
beamwidth is maintained at 40° (+20°, -10°) over the range
2.1 kHz to 20 kHz.

Figure 2: Directivity vesus Frequency

Figure 3: 6-dB-Down Beamwidth versus Frequency

USA
Canada
Germany
France
Australia
Hong Kong
Japan
Singapore
Mexico
UK
Africa, Mid-East
Latin America

12000 Portland Ave South, Burnsville, MN 55337, Phone: 952-884-4051, FAX: 952-884-0043
705 Progress Avenue, Unit 46,Scarborough, Ontario, Canada, M1H2X1,Phone: 416-431-4975, 800-881-1685, FAX: 416-431-4588
Hirschberger Ring 45, D94315, Straubing, Germany, Phone: 49 9421-706 0, FAX: 49 9421-706 287
Parc de Courcerin, Alle Lech Walesa, Lognes, 77185 Marne La Vallee, France, Phone: 33/1-6480-0090, FAX: 33/1-6480-4538
Unit 23, Block C, Slough Business Park, Slough Avenue, Silverwater, N.S.W. 2128, Australia, Phone: 61/2-9648-3455, FAX: 61/2-9648-5585
Unit E & F, 21/F, Luk Hop Industrial Bldg., 8 Luk Hop St., San PO Kong, Kowloon, Hong Kong, Phone: 852-2351-3628, FAX: 852-2351-3329
5-3-8 Funabashi, Setagaya-ku, Tokyo, 156-0055 Japan, Phone: +81 (0) 3-5316-5020, FAX: +81 (0) 3-5316-5031
3015A Ubi Rd 1, 05-10, Kampong Ubi Industrial Estate, Singapore 408705, Phone: 65-746-8760, FAX: 65-746-1206
Av. Parque Chapultepec #66-201, Col. EI. Parque Edo. Mex. 53390, Phone: (52) 5358-5434, FAX: (52) 5358-5588
4, The Willows Centre, Willow Lane, Mitcham, Surrey CR4 4NX, UK, Phone: 44 181 640 9600, FAX: 44 181 646 7084
12000 Portland Ave South, Burnsville, MN 55337, Phone: 952-887-7424, FAX: 952-887-9212
12000 Portland Ave South, Burnsville, MN 55337, Phone: 952-887-7491, FAX: 952-887-9212

www.electrovoice.com • Telex Communications, Inc. • www.telex.com
© Telex Communications, Inc. 02/2001
Part Number 38109-962 Rev A

U.S.A. and Canada only.
For customer orders, contact the Customer Service department at
800/392-3497 Fax: 800/955-6831
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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