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20” (508 mm)
39”
(991 mm)
30” (762 mm)
Cinema Mid
-
High Loudspeaker System User Manual
MH
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1075C
10” (254mm) mid, 3.0” (75mm) compression driver
Introduction
The MH-1075C “mid-high pack” provides the mid and high frequency components of
three-way screen channel loudspeaker systems for high performance cinema applica-
tions. They were designed to operate with and be directly mounted on QSC’s cinema
low-frequency enclosures.
Mid frequencies are reproduced with a 10” (254mm) high-efficiency, phase-ring
loaded driver mounted on a custom designed cinema horn. The high-frequency driver
is a large format, 3.0” (75mm) titanium diaphragm compression driver mounted on a
custom high-frequency cinema horn. The high frequency horn is a low-distortion
waveguide providing highly articulate dialogue without coloration associated with con-
ventional horn loudspeakers. Both horns feature broad horizontal and vertical cover-
age angles to ensure coverage of every seat in the auditorium. The driver assemblies
are mounted on an adjustable pan and tilt bracket that has an integral aiming sight,
simplifying installation.
The MH-1075C loudspeaker includes a driver protection and crossover network to
assure reliable operation. DC blocking capacitors protect against DC or low-frequency
signals that could damage an unprotected driver. Power limiter circuitry protects the
driver from over-powering and an 18dB/octave crossover seamlessly blends the high
and mid frequency elements. Outboard processing is required to form the crossover
between the LF and MH loudspeakers.
Bi-amp or tri-amp operation is possible using a selector switch mounted on the con-
nections panel. The bi-amp setting provides a passive crossover network between
mid and high drivers. Separate amplifiers and an active crossover are required for the
low frequency channel and the mid-high channel. Tri-amp setting disables the internal
mid-high crossover and each driver is driven independently by its own amplifier and
active crossover; one for the low, one for the mid, and one for the high frequencies.
The MH-1075C components come pre-assembled to reduce field assembly time.
Three bolts are all that are required to secure the mid-high assembly to the top of a
QSC low-frequency enclosure.
Install in accordance with QSC Audio Product’s instructions and a licensed,
professional engineer. Only use attachments, mounts, accessories, or
brackets specified by QSC Audio Products, LLC Refer all servicing to quali-
fied personnel. Servicing is required when the apparatus has been damaged
in any way.
WARNING! Before placing, installing, rigging, or suspending any speaker
product, inspect all hardware, suspension, cabinets, transducers, brackets
and associated equipment for damage. Any missing, corroded, deformed or
non
-
load rated component could significantly reduce the strength of the
installation, placement, or array. Any such condition severely reduces the
safety of the installation and should be immediately corrected. Use only
hardware which is rated for the loading conditions of the installation and
any possible short
-
term unexpected overloading. Never exceed the rating of
the hardware or equipment. Consult a licensed, professional engineer when
any doubt or questions arise regarding a physical equipment installation.
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© Copyright 2012, QSC Audio Products, LLC
QSC® is a registered trademark of QSC Audio Products, LLC
“QSC” and the QSC logo are registered with the U.S. Patent and Trademark Office
1675 MacArthur Blvd., Costa Mesa, CA, 92626 USA
Main Number (714) 754
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6175 Sales & Marketing (714) 957
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7100 or toll free (USA only) (800) 854
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4079
Customer Service(714) 957
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7150 or toll free (USA only) (800) 772
-
2834
*TD
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