MH4020NC Neodymium Driver Coaxial Stadium Horn System
MH4020NC Neodymium Driver Coaxial Stadium Horn System
3
is then further filtered with an 80-Hz, 12-dB-
per-octave high-pass filter to prevent out-of-
passband displacement. The amplifier is set
to provide 1,200 watts into the 6.9-ohm EIA
equivalent impedance (91.0 volts). Ampli-
fier clipping sets instantaneous peaks at 6 dB
above the continuous power or 4,800 watts
peak (182.0 volts). During this test, the mid-
band section is not high passed at 1,600 Hz.
The high-frequency section’s power han-
dling is dependent on the selected driver
combination. Please refer to the relevant en-
gineering data sheet.
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°, deviating no more
than +20°/–5° from this angle over the range
of 350 Hz to 20 kHz. It shall produce a ver-
tical beamwidth of 20°, deviating no more
than +30°/–5°over the frequency range of
350 Hz to 20 kHz. In addition, it shall pro-
vide an acoustic load to below 100 Hz.
The MH4020NC mid-bass section shall op-
erate over the range of 100 Hz to 4,000 Hz,
with a recommended crossover frequency of
1,600 Hz, and be driven by four 10-inch,
weather-resistant drivers with high-technol-
ogy cones of Kevlar
®
and epoxy.
1
The pat-
ented Manifold Technology
®
technique shall
be exploited and result in a power-handling
capacity of 1,200 watts per EIA Standard RS-
426A. The average axial sensitivity shall be
112 dB SPL at 1 meter with 2.83 volts ap-
plied. The frequencies above 1,600 Hz shall
be produced by the supplied Electro-Voice
HP420A TransPlanar
TM
constant-directivity
horn with user-selectable driver combina-
tions.
The horn bell manifold chamber and back
covers shall be constructed of fiberglass,
foam and polyester resin. Two steel mount-
ing rails shall be provided to coaxially mount
the Electro-Voice HP420A horn. The horn
shall have an integral rear mounting bracket
made of black powder-coated 10-gauge steel.
Brackets shall be provided at the front of the
horn to stabilize and aim the MH4020NC.
The horn shall be 1500 mm (59.0 in.) high,
991 mm (39.0 in.) wide, 1880 mm (80.0 in.)
long and weigh 95.4 kg (205 lb).
The horn shall be the Electro-Voice
MH4020NC coaxial constant-directivity
Manifold Technology
®
horn.
Limited Warranty
Electro-Voice products are guaranteed
against malfunction due to defects in mate-
rials or workmanship for a specified period,
as noted in the individual product-line
statement(s) below, or in the individual prod-
uct data sheet or owner’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 returned to the customer prepaid. Ex-
clusions and Limitations: The Limited
Warranty does not apply to: (a) exterior fin-
ish or appearance; (b) certain specific items
described in the individual product-line
statement(s) below, or in the individual prod-
uct data sheet or owner’s manual; (c) mal-
function resulting from use or operation of
the product other than as specified in the
product data sheet or owner’s manual; (d)
malfunction resulting from misuse or abuse
of the product; or (e) malfunction occurring
at any time after repairs have been made to
the product by anyone other than Electro-
Voice Service or any of its authorized ser-
vice representatives. Obtaining Warranty
Service: To obtain warranty service, a cus-
tomer must deliver the product, prepaid, to
Electro-Voice Service or any of its autho-
rized service representatives together with
proof of purchase of the product in the form
of a bill of sale or receipted invoice. A list of
authorized service representatives is avail-
able from Electro-Voice Service at 600 Cecil
Street, Buchanan, MI 49107 (800/234-6831
or FAX 616/695-4743). Incidental and
Consequential Damages Excluded: Prod-
uct repair or replacement and return to the
customer are the only remedies provided to
the customer. Electro-Voice shall not be li-
able for any incidental or consequential dam-
ages including, without limitation, injury to
persons or property or loss of use. Some
states do not allow the exclusion or limita-
tion of incidental or consequential damages
so the above limitation or exclusion may not
apply to you. Other Rights: This warranty
gives you specific legal rights, and you may
also have other rights which vary from state
to state.
Electro-Voice Speakers and Speaker Sys-
tems are guaranteed against malfunction due
to defects in materials or workmanship for a
period of five (5) years from the date of origi-
nal purchase. The Limited Warranty does not
apply to burned voice coils or malfunctions
such as cone and/or coil damage resulting
from improperly designed enclosures. Elec-
tro-Voice active electronics associated with
the speaker systems are guaranteed for three
(3) years from the date of original purchase.
Additional details are included in the Uni-
form Limited Warranty statement.
For warranty repair or service informa-
tion, contact the service repair department
at: 616/695-6831 or 800/685-2606.
For technical assistance, contact Technical
Support at 800/234-6831 or 616/695-6831,
M-F, 8:00 a.m. to 5:00 p.m. Eastern Stan-
dard Time.
Specifications subject to change without
notice.
