General Product Description

The Electro-Voice®model HP420 is a wide-range, flat-front, high-frequency, constant-directivity horn. The horizontal angle is controlled over a frequency range of 650 Hz to 20 kHz and the vertical angle is controlled from 2.2 kHz to 20 kHz, both with unusual precision and adherence to the intended angle. Furthermore, excellent loading is maintained to a low frequency of 500 Hz.

The flat-front design makes the HP420 suitable for all modern boxed and clustered systems. A special vaned waveguide throat detail gives the HP420 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 40 degrees, deviating no more that 20 degrees from this angle over the frequency range 650 to 20,000 Hz. It shall produce a vertical beamwidth of 20 degrees, deviating no more than 10 degrees from this angle over the frequency range 2,200 to 20,000 Hz. In addition, it shall provide useful acoustic loading at all frequencies above 500 Hz.

The horn shall be of hybrid fiberglass-and-zinc construction. The driver-mounting flange and initial

HP420

Constant-Directivity

Horn

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

36.7cm (14.4 in.) high, 61.0 cm (24.0 in.) wide, and

74.9cm (29.5 in.) long. It shall weigh no more than 5.9 kg (13.0 lb).

The horn shall be the Electro-Voice model HP420 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:

40° (+20°, -10°) (-6 dB 650 Hz to 20 kHz)

Vertical Beamwidth:

20° (+10°, -10°) (-6 dB, 2.2 kHz to 20 kHz)

Directivity Factor Rθ(Q):

47.5 (average 1.25 kHz to 20 kHz)

Directivity Index Di:

16.8 dB

10 log Rθ, (average 1.25 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 or DH2A

Weight:

5.9 kg (13.0 lb)

500 Hz

HP420 specifications

Electro-Voice has long been recognized as a leader in professional audio equipment, and the HP420 is a prime example of their commitment to innovation and quality in sound reproduction. This high-performance speaker is designed to meet the demanding requirements of live sound applications, offering a combination of power, clarity, and versatility.

One of the standout features of the HP420 is its exceptional sound quality. Engineered with a proprietary high-frequency driver, the speaker delivers crisp and detailed highs, ensuring that every nuance of the audio is reproduced accurately. The mid-range is equally impressive, providing a balanced and rich sound that is ideal for vocals and instruments alike. Additionally, the low-frequency response is robust and punchy, thanks to the advanced woofer design, making the HP420 a well-rounded choice for any audio setup.

In terms of technology, the HP420 incorporates Electro-Voice's unique DSP (Digital Signal Processing) algorithms, which help optimize audio performance in real-time. This ensures that the speaker operates efficiently across a wide range of frequencies, minimizing distortion and enhancing overall sound fidelity. The intelligent thermal management system is another key innovation, preventing overheating during extended use and ensuring reliable performance in high-pressure environments.

The construction of the HP420 is also noteworthy. Designed for durability, the cabinet is built from high-quality materials that can withstand the rigors of touring and live performances. Its lightweight yet sturdy design makes it easy to transport and set up, which is a crucial feature for sound engineers and performers on the go.

The versatility of the HP420 is further enhanced by its connectivity options. It supports various input configurations, allowing it to be integrated seamlessly into different audio systems. Whether used as a standalone speaker or part of a larger array, the HP420 adapts effortlessly to any setup.

Overall, the Electro-Voice HP420 stands out as a powerful and reliable speaker that meets the needs of professionals in the music and events industry. With its impressive sound quality, advanced technologies, and robust design, the HP420 not only elevates the audio experience but also delivers the performance required for today’s demanding audio environments. Whether for concerts, corporate events, or other applications, the HP420 is a compelling choice for anyone seeking top-tier sound reproduction.