Electro-Voice HP66 specifications TransPlanar Constant-Directivity Horn, Specifications

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

Horn

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.

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:

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)

1000 Hz