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Description

The Electro-Voice MH4020AC is a wide-

range, 40° x 20° mid-bass/high-frequency

constant-directivity horn-and-driver system

utilizing Ring-Mode Decoupling (RMD™).

With a contractor-installed high-frequency

driver, it covers the frequency range of 100

Hz to 20,000 Hz with minimal equalization.

The MH4020AC combines two pioneering

concepts developed by Electro-Voice: con-

stant-directivity horns and Manifold Tech-

nology

®

. The MH4020AC’s potentially high

acoustic output, stable directional character-

istics, and extended low-frequency perfor-

mance make it highly suitable for music and

speech reinforcement in large indoor and out-

door venues.

At the heart of the MH4020AC are four

DL10X-SH 10-inch water-resistant drivers

(U.S. Patent No. 4,547,632). The driver has

been specially developed for the MH series

of horns. It incorporates a unique diaphragm

construction of Kevlar

®

 and epoxy.

1

 This

combination of high-technology materials

produces a diaphragm with a strength-to-

weight ratio on the order of twice that of

conventional materials. Each driver is inte-

grally mounted to the fiberglass horn bell via

a heavy-duty mounting bracket and propri-

etary Aperiodic Enhancer

TM

 phase plug (U.S.

Patent No. 4,718,517). The Aperiodic

Enhancer

TM

 is responsible for the extended

high-frequency response of the MH4020AC’s

mid-band section. It makes use of the fact

that only the apex of the cone (near the voice

coil) is in motion at higher frequencies, and

automatically adjusts the acoustic loading to

maximize acoustic output.

Manifolding allows the output of two or

more drivers to be summed without the usual

detrimental interference problems in the

pass-band. There are a number of additional

advantages to manifolding, including re-

duced distortion (see Figure 5) and increased

efficiency at certain frequencies. There is

also redundancy built into the system; in the

unlikely event of a driver failure, one remains

available. The DLX10-SH drivers are con-

tained and sealed within fiberglass covers

optimally tuned for maximum low-end

perfomance and displacement control.

The frequencies above 1,600 Hz are handled

by the Electro-Voice HP420A constant-di-

rectivity horn, in combination with a con-

tractor-selected and installed high-frequency

compression driver.

Ring-Mode Decoupling (RMD™)

The MH4020AC controls both acoustical

and mechanical ring modes to provide dra-

matically increased intelligibility, using tech-

niques learned from the development of the

Electro-Voice X-Array™ concert speakers.

There is much less coloration of the sound

from resonating sources, leaving only the

intended sound to be heard by the audience.

Installation

Suspending any object is potentially dan-

gerous and should only be attempted by in-

dividuals who have a thorough knowledge

of the techniques and regulations of rig-

ging items overhead. Electro-Voice strongly

recommends that the MH4020AC be sus-

pended in accordance with all current na-

tional, federal, state and local regulations.

It is the responsibility of the installer to

ensure that the MH4020AC is safely in-

stalled in accordance with all such regula-

tions.

The MH4020AC is designed to be suspended

safely and easily. The integral mounting

brackets at the rear should be used as the

main structural hanging location. There are

also two structural hanging locations on the

MH4020AC

Coaxial Stadium Horn
System

• Constant-Directivity Manifold

Technology

®

 Horn system with

40° X 20° coverage pattern

• Ring-Mode Decoupling (RMD™)

technology for outstanding intelligi-
bility and clarity

• Includes four DL10X-SH, 10 inch

midrange RMD™ drivers

• Includes HP420A high-frequency

horn and mounting bracket

• Use EV Neodymium or Ferrite

HF drivers, single or manifolded
(HF drivers sold separately)

• Excellent response down to 100 Hz,

eliminates supplemental low fre-
quency systems in many applications

• Large mouth provides high directivity

at low frequencies

1. Kevlar is a registered trademark of DuPont

Содержание MH4020AC

Страница 1: ...e unlikely event of a driver failure one remains available The DLX10 SH drivers are con tained and sealed within fiberglass covers optimally tuned for maximum low end perfomance and displacement contr...

Страница 2: ...on Directivity The axial directivity factor R of the MH4020AC was computed at each of the one third octave center frequencies over the frequency range noted from the horizontal vertical polars shown i...

Страница 3: ...s manual beginning with the date of original purchase If such malfunction occurs during the specified pe riod the product will be repaired or replaced at our option without charge The product will be...

Страница 4: ...xial Stadium Horn System MH4020AC Coaxial Stadium Horn System 4 Figure 1 Polar Response 5 dB per division HORIZONTAL VERTICAL 160 Hz 200 Hz 250 Hz 315 Hz 400 Hz 500 Hz 1 6 kHz 800 Hz 630 Hz 2 kHz 3 15...

Страница 5: ...m Horn System 5 Figure 3 Axial Frequency Response Mid Band Section only 1 watt 1 meter Figure 2 Axial Frequency Response 1 600 Hz crossover 2 96 ms delay with broadband equalization 5 dB per division...

Страница 6: ...MH4020AC Coaxial Stadium Horn System MH4020AC Coaxial Stadium Horn System 6 Figure 4 Impedance Response one paralleled pair of drivers Figure 5 Distortion Response 10 Power Figure 6 Beamwidth Response...

Страница 7: ...OHMS 8 OHMS 16 OHMS 16 OHMS 16 OHMS 16 OHMS Figure 8 Dimensions 1 475 mm 58 in REF 975 mm 38 in REF 1 878 mm 73 9 in 56 mm 2 2 in 38 mm 1 5 in 841 mm 33 in REF 790 mm 31 in REF 6 3 mm 25 in DIAMETER H...

Страница 8: ...ingle Driver DH1A DH2A N DYM1 ND5 2 Manifold Drivers DH2A MT N DYM1 MT Manifolded Driver systems DH1A 2MT Construction Mid bass horn One piece black polyester and fiberglass with fiberglass rib reinfo...

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