QSC Audio MH-1063, MH-1075 User Manual

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Cinema Mid-High Loudspeaker System User Manual

MH-1063 10” (254mm) mid, 2.5” (63mm) compression driver
MH-1075 10” (254mm) mid, 3.0” (75mm) compression driver

Introduction

The MH-1063 and MH-1075 “mid-high packs” provide the mid and high frequency
components of three-way screen channel loudspeaker systems for high performance
cinema applications. 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, 2.5” (63mm, MH-1063) or 3.0” (75mm, MH-1075) 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 conventional horn loudspeakers. Both horns fea­ture broad horizontal and vertical coverage 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-1063 and MH-1075 loudspeakers include 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 con­nections 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-1063 and MH-1075 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, Inc. Refer
all servicing to qualified 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.

*TD-000180-00*

“QSC” and the QSC logo are registered with the U.S. Pa tent and Trademark Office

QSC® is a registered trademark of QSC Audio Products, Inc.

© Copyright 2004, QSC Audio Products, Inc.

TD-000180-00 rev.A

Mounting

Attaching to Low Frequency Enclosure

The mid-high loudspeaker assembly attaches to the top of the QSC low frequency cabinet with three 5/16-18 bolts, 0.75” long, with
lock washers. This hardware ships installed on the low frequency cabinet. We recommend the use of serviceable thread locking com­pound when installing the bolts to prevent loosening due to vibration. Do not fully tighten the mounting hardware before aiming (see
below).

Aiming

Aim the horn in the horizontal plane (pan) before tightening the attachment hardware. Adjust the vertical tilt with the mid-high vertical
adjustment bracket. The mid-high assembly is equipped with an aiming sight to assist in achieving desired coverage quickly and easily.
For typical applications, the aim point should be the center seat in the back row of the auditorium. If the cinema screen has already
been installed, a flashlight placed at the desired aiming point can be seen through the screen perforations in a darkened auditorium.

Where the sight holes are located:

How to use the sights:

Settings

BI-AMP / TRI-AMP Operating Mode Selection

Set the operating mode selector switch to BI-AMP or TRI-AMP, depending on your application setup.

Aim point:

BI-AMP-When set to BI-AMP, the MH-1063 and MH-1075 accepts mid-

high frequency signals on one set of inputs and uses an internal crossover
network between the mid- and high-frequency drivers. The signal applied
to the mid-high loudspeaker assembly must not contain low-frequency
content (below 200 Hz).

TRI-AMP- When set to TRI-AMP, the MH-1063 and MH-1075 accepts
separate mid- and high-frequency signals on two sets of inputs. The inter­nal crossover network is bypassed and only the protective circuitry for the
H.F. driver remains. Each of the driver’s signals must have the appropriate
signal processing before operating.

Do not connect amplifiers directly to the driver inputs!
Always use the input terminal strip.

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Connections

INPUT Terminals

The MH-1063 and MH-1075 have barrier strip screw terminals that accept up to #10 AWG (5.3mm
Observe proper polarity. Use the largest wire size and shortest wire length for the application.

OUTPUT Terminals

The OUTPUT terminals are factory-connected to the drivers. These terminals should ONLY be connected to their respective driver. Do
not connect signals to these terminals as all protection and equalization circuitry will be bypassed.

NOTE! Maintain proper loudspeaker connection polarity throughout the entire system for maximum performance.
Do not apply full range signal to the MH-1063 / MH-1075! There is a mid-high passive crossover for bi-amp mode
only. There is no crossover connected when operating in tri-amp mode. A protection network is always active. All
required signal processing must be done before the signal is applied to the loudspeaker. Do not connect any sig­nal to the upper sets of OUTPUT terminals.

BI-AMP mode connections- Ensure the mode switch is set to BI-AMP, connect the input to the MH-1063 / MH-1075 to the lower
set of input terminals marked “BI-AMP + -”.

BI-AMP Mode- one

amplifier channel is used
for the low frequency
cabinet and one amplifier
channel for the mid-high
assembly. The MH-1063 /
MH-1075 mode switch is
set to BI-AMP. Active
crossovers are used
before amplification. The
mid-high assembly pro­vides a passive crossover
between the mid and
high frequency drivers.

2

) stranded loudspeaker wire.

3