EV HP 64

The Electro-Voice® model HP64 is a wide-range,

flat-front, high-frequency, constant-directivity horn. The

horizontal angle is controlled over a frequency range

of 1.7 kHz to 20 kHz and the vertical angle is controlled

from 1.8 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 HP64 suitable for all

modern boxed and clustered systems. A special vaned

waveguide throat detail gives the HP64 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

60 degrees, deviating no more that 30 degrees from

this angle over the frequency range 2,000 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 1,600 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 driver-mounting flange and initial

throat section shall be constructed of die-cast zinc and

shall be integrally laminated into the fiberglass portion

of the 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).

The horn shall be the Electro-Voice model HP64

constant-directivity horn.

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