Electro-Voice HP66 User Manual

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

HP66

TransPlanar

Constant-Directivity

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.

™

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).

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 Rθ (Q):

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)

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, DH2As2

Weight:

2.2 kg (4.8 lb)

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Figure 1: Dimensions

Directivity

The directional characteristics of the HP66 were measured
in Electro-Voice’s large anechoic chamber using a stock
Electro-Voice® DH1A. The test signal was one-third-octave
filtered pink-noise at the frequencies indicated. A full spherical
measurement system was used. All directional information
was measured at 6.1 meters (20 feet) from the horn.

This illustrates the total directivity of the HP66. The directivity factor R

(Q) is the relative value at a point of the HP66 when compared to an

θ

ideal spherical response. The directivity index Di is calculated by

Figure 2: Directivity vesus Frequency

Di=10log10R

USA 12000 Portland Ave South, Burnsville, MN 55337, Phone: [phone], FAX: [phone]
Canada 705 Progress Avenue, Unit 46,Scarborough, Ontario, Canada, M1H2X1,Phone: [phone], FAX: [phone]
Germany Hirschberger Ring 45, D94315, Straubing, Germany, Phone: [phone], FAX: [phone]
France Parc de Courcerin, Alle Lech Walesa, Lognes, 77185 Marne La Vallee, France, Phone: [phone], FAX: [phone]
Australia Unit 23, Block C, Slough Business Park, Slough Avenue, Silverwater, N.S.W. 2128, Australia, Phone: [phone], FAX: [phone]
Hong Kong Unit E & F, 21/F, Luk Hop Industrial Bldg., 8 Luk Hop St., San PO Kong, Kowloon, Hong Kong, Phone: [phone], FAX: [phone]
Japan 5-3-8 Funabashi, Setagaya-ku, Tokyo, 156-0055 Japan, Phone: [phone], FAX: [phone]
Singapore 3015A Ubi Rd 1, 05-10, Kampong Ubi Industrial Estate, Singapore 408705, Phone: [phone], FAX: [phone]
Mexico Av. Parque Chapultepec #66-201, Col. EI. Parque Edo. Mex. 53390, Phone: [phone], FAX: [phone]
UK 4, The Willows Centre, Willow Lane, Mitcham, Surrey CR4 4NX, UK, Phone: [phone], FAX: [phone]
Africa, Mid-East 12000 Portland Ave South, Burnsville, MN 55337, Phone: [phone], FAX: [phone]
Latin America 12000 Portland Ave South, Burnsville, MN 55337, Phone: [phone], FAX: [phone]

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www.electrovoice.com  Telex Communications, Inc.  www.telex.com

© Telex Communications, Inc. 02/2001
Part Number 38109-958 Rev A

Figure 3: 6-dB-Down Beamwidth versus Frequency

This shows the horizontal and vertical beamwidths. Beamwidth is the

angle at which the horizontal and vertical polar responses have

decreased in level by 6 dB when compared with the axial frequency

For customer orders, contact the Customer Service department at

For warranty repair or service information, contact the Service

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.

U.S.A. and Canada only.

800/392-3497 Fax: [phone]

Repair department at 800/685-2606