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MTH-1
Biampable,
Mid/High Coaxial Module
Speaker System
• Two-way mid/high horn-loaded
system
• 350-watt long-term power capacity
• Rotatable coaxial mid/high section
• Rugged, road-ready cabinet; metal
grille; black carpet finish
• High "Q" system for increased
intelligibility
• Neutrik Speakon
®
inputs
• Biampable
• When combined with the MLT-1 or
MTL-1X, forms an MT-1 system
which is a highly efficient and
compact system
Description
The Electro-Voice MTH-1 is a 350-watt,
two-way, constant directivity horn-loaded,
high-efficiency main loudspeaker system.
The system may be biamplified or used full
range with the internal passive crossover.
The MTH-1 mid/high module, combined
with an MTL-1 or MTL-1X low-frequency
system, forms a high-output sound reinforce-
ment for a club, large hall, or outdoor events
in a compact package which can be used eas-
ily by a two-person crew.
The 60° x 40° high- and mid-frequency horns
are coaxially mounted and are easily rotated
together, allowing the horizontal and verti-
cal coverage patterns to be interchanged. The
high “Q” pattern gives increased intelligi-
bility. Combined with the trapezoidal enclo-
sure, the high “Q” and rotatable horns give
many options in placing this versatile enclo-
sure in tight spaces.
The high-frequency section operates above
1,600 Hz. The DH2T compression driver is
coupled to the HP64M 60° x 40° constant-
directivity horn for smooth and extended
high-frequency performance to 16,000 Hz.
The HP64M is a polypropylene horn with ex-
ceptional strength and performance. The
horn/driver combination is securely mounted
to the mid horn by a heavy-duty steel bracket.
The mid-frequency section operates between
160 Hz and 1,600 Hz. This horn-loaded sec-
tion uses a DL10X. A proprietary phase plug
(U.S. Patent No. 4,718,517) is used to ex-
tend the high-end output and blend
seamlessly into the coaxial high-frequency
section.
Crossover
To optimize performance with a low-fre-
quency system, such as the MTL-1, the
MTH-1 should be used in conjunction with
an active crossover with a minimum slope
of 12-dB-per-octave and a crossover fre-
quency of 160 Hz. Due to the high efficiency
of the MTH-1, less amplifier input is needed
to achieve a given sound output level.
Biamping
The MTH-1 can be biamped by removing the
input panel and following the instructions
given. The usable frequency ranges for the
individual sections are 125-2,000 Hz for the
mid-frequency band and 1,200-16,000 Hz for
the high-frequency band. Minimum cross-
over slopes of 12-dB-per-octave are recom-
mended. A protection capacitor with a 3-dB-
down point of 1,100 Hz is in included in the
high-frequency section when in biamp mode.
The usable frequency response of the over-
all biamped system is 125-16,000 Hz, the
same response that is expected with the pas-
sive setup. For maximum performance of the
MTH-1 in a full-range application, the addi-
tion of the MTL-1 low-frequency loud-
speaker system is recommended. This com-
bination forms the MT-1 full-range high-
level sound-reinforcement system. For use
as an MT-1 system, the Electro-Voice's Dx34
Digital Signal Processing unit or XEQ-3
electronic crossover/equalizer/time delay unit
with the EQMT1 plug-in modules may be
used for crossing over the two sections.
Amplifier Power recommendations
As noted in the Power-Handling section,
below, the MTH-1 has a random-noise power
capacity of 350-watts long term (1,400 watts
peak) per EIA RS-426-A 1980. The follow-
ing guidelines will help relate this to an ap-
propriate power amplifier output rating.
1. To use the MTH-1 to full capacity,
skilled experts in sound system installation
and operation will obtain the best results if
the power amplifier is 2.0 to 4.0 times the
long-term average noise power rating of the