QSC SC-424 Manual

QSC Højttaler SC-424

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*TD-000246-00*

Cinema Mid-High-Very High Loudspeaker System User Manual

MHV-1090 10” (254mm) mid, coax high- very high compression driver

Introduction

The MHV-1090 system provides the mid, high, and very high frequency components of

four-way screen channel loudspeaker system for high performance cinema applica-

tions. It was designed to operate with and be directly mounted on QSC’s cinema low

frequency enclosures.

The high frequency horn is a low-distortion waveguide providing highly articulate dia-

logue without the coloration associated with conventional horn loudspeakers. Both

horns feature broad horizontal and vertical coverage to ensure audio integrity is deliv-

ered to every seat in the auditorium. The driver assemblies are mounted on an adjust-

able pan and tilt bracket that has an integral aiming sight, simplifying installation.

The MHV-1090 includes a driver protection and high-very high frequency crossover

network to assure reliable operation. DC blocking capacitors protect against DC or

low-frequency signals that could damage an unprotected driver. A 12 dB per octave

crossover seamlessly blends the high and very high frequency elements when oper-

ated in tri-amp mode. Outboard processing is required to form the crossover between

the low, mid, and high-very high frequency drivers.

Tri-amp or quad-amp operation is possible using a selector switch mounted on the

INPUTS connection panel. The tri-amp setting provides a built-in passive crossover

network between high and very high frequency drivers. Separate amplifiers and active

crossovers are required for the low, mid, high-very high frequency channels. Quad-

amp setting disables the internal high-very high frequency crossover and each driver

is driven independently by its own amplifier and active crossover; one each required

for the low, mid, high, and very high frequency drivers.

The MHV-1090 components come pre-assembled to reduce field assembly time. Three

bolts are all that are required to secure the assembly to the top of a QSC low fre-

quency 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, enclosures,

transducers, brackets and associated equipment for damage. Any

missing, corroded, deformed or non-load rated component could sig-

nificantly 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 hard-

ware or equipment. Consult a licensed, professional engineer when

any doubt or questions arise regarding a physical equipment installa-

tion.

TD-000246-00-A

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

“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) 754-6175 Sales & Marketing (714) 957-7100 or toll free (USA only) (800) 854-4079

Customer Service(714) 957-7150 or toll free (USA only) (800) 772-2834

30”

(762mm)

39”

(991mm)

20”

(508mm)

Settings and Connections

TRI-AMP / QUAD-AMP Operating Mode Selection

Set the operating mode selector switch to TRI-AMP or QUAD-AMP, depending on your screen chan-

nel signal processing and amplification set-up. The mid frequency driver will require connection to its

rear cover terminals, regardless of mode selection. The low frequency driver will also require its own,

separate connections. The only connection difference between tri-amp and quad-amp modes is in

quad-amp mode, the very high frequency signal will require connection to the terminals labeled VHF.

TRI-AMP-When set to TRI-AMP, the MHV-1090 input panel connections accept high frequency/very

high frequency signals on one set of inputs and uses an internal crossover network between the high

and very high frequency drivers.

QUAD-AMP- When set to QUAD-AMP, the MHV-1090 input panel accepts separate high and very

high frequency signals on two separate sets of inputs. The internal crossover network is bypassed and

only the protective circuitry for the high frequency and very high frequency driver remains. Each of the

driver’s signals must have the appropriate upstream signal processing.

•Do not connect amplifiers directly to the high/very high frequency coaxial driver

inputs!

• Always use the crossover INPUTS terminal strip for high and very high frequency

input(s)

•The mid frequency driver and the low frequency enclosure are connected directly

to their own separate amplifiers regardless of mode selector switch setting.

Mounting

Attaching to Low Frequency Enclosure

The MHV-1090 attaches to the top of QSC low frequency enclosures with three 0.75” long 5/16”-18 TPI bolts. ensure the use of lock washers on all bolts.

The bolts and washers ship installed on the low frequency enclosure. 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 in the horizontal plane (see below).

Aiming

Aim the horn in the horizontal plane (pan) before tightening the three bolts securing the MHV-1090 to the low frequency enclosure. Adjust the vertical tilt

with the 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 flash-

light 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:

Aim point:

HF/VHF

VHF

Mode selector switch set to

TRI-AMP and the required

HF/VHF connection:

Mode selector switch set to

QUAD-AMP and the required sep-

arate HF and VHF connections: