Constant-Directivity Supertweeter Horn Specification Sheet

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HPT94

Constant-Directivity

Supertweeter Horn

General Product Description

The Electro-Voice

model HPT94 is a wide-range, flat-

front, constant-directivity super-tweeter horn. Both

horizontal and vertical angles are controlled from 3 kHz

to 20 kHz with unusual precision and adherence to the

intended angle. Furthermore, excellent loading is

maintained to 1,600 Hz. The flat-front design makes

the HPT94 suitable for all modern boxed and clustered

systems.

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 than 15 degrees from

this angle over the frequency range 3 kHz to 20 kHz. It

shall produce a vertical beamwidth of 40 degrees,

deviating no more than 20 degrees from this angle over

the frequency range 4 kHz to 20 kHz. In addition, it

shall provide useful acoustic loading at all frequencies

above 1.6 kHz.

The horn shall be of hybrid fiberglass-and-zinc

construction. The initial throat section shall be

constructed of die-cast zinc and shall be integrally

laminated into the fiberglass portion of the 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:

90° (+15°, -15°) - (-6 dB 3 kHz to 20 kHz)

Vertical Beamwidth:

40° (+20°, -10°) - (-6 dB, 4 kHz to 20 kHz)

Directivity Factor R

(Q):

11.6 (average 3 kHz to 20 kHz)

Directivity Index D

10.6 dB (+1.2, -1.6 dB)

10 log R

θθ

, (average 3 kHz to 20 kHz)

Lowest Recommended Crossover Frequency:

1.6 kHz

The horn shall possess a throat of 2.36 cm (0.93 in.)

diameter and shall be provided with a 1-3/8"-18

threaded hole for mounting of a compression driver.

The horn shall be 13.3 cm (5.3 in.) high, 13.3 cm (5.3

in.) wide, and 10.1 cm (4.0 in.) long. It shall weigh no

more than 1.8 kg (4.0 lb).

The horn shall be the Electro-Voice model HPT94

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:

1-3/8"-18 threaded hole

Recommended Driver:

DH2010A, DH2T

Weight:

1.8 kg (4.0 lb)

Summary of content (2 pages)

PAGE 1
HPT94 Constant-Directivity Supertweeter Horn General Product Description The Electro-Voice® model HPT94 is a wide-range, flatfront, constant-directivity super-tweeter horn. Both horizontal and vertical angles are controlled from 3 kHz to 20 kHz with unusual precision and adherence to the intended angle. Furthermore, excellent loading is maintained to 1,600 Hz. The flat-front design makes the HPT94 suitable for all modern boxed and clustered systems.
PAGE 2
Dimensions: Inches A 1 3/8 - 18 B 3.36 C 5.25 D 5.25 E 0.190 x 8 F 3.24 Figure 1: Dimensions Directivity Beamwidth The axial directivity factor Rθ (formerly Q) of the HPT94 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 3 kHz to 20 kHz. The axial frequency response of the HPT94 horn with a particular driver is in close correspondence to that driver’s power response above 3 kHz.