QSC Audio Speaker System SC 312X User Guide

SC-312X

Cinema Loudspeaker System

Features

• Passive, two-way, screen channel system

• SC-312X provides 90° horizontal by +15° to -35° vertical coverage

• Low distortion waveguide provides highly articulate dialogue

• Shallow depth (20") facilitates installation

Developed specifically for the unique requirements

of professional motion picture playback, the SC-312X

extends QSC’s commitment to the cinema market. As

a member of the DCS Digital Cinema Speaker Series,

the SC-312X is a passive, two-way, screen channel

loudspeaker system comprised of two main units—the

HF-63X1 high frequency system and the LF-3115 low-

frequency system.

Specifications

Nominal Coverage

Frequency Range

Impedance

SC-312X

90° horizontal x +15 to -35° vertical

33 Hz - 16 kHz (-6 dB)

8Ω

Sensitivity 1 watt/1 meter,

half space

95 dB

Maximum Input Power¹

The HF-63X1 high-frequency system features a 2.5"

(63mm) titanium diaphragm compression driver

mounted on a custom designed high frequency

cinema horn with an adjustable pan and tilt bracket.

The HF-63X1 includes a driver protection and

equalization network. DC blocking capacitors protect

against DC or low-frequency signals that would

likely destroy an unprotected driver. Power limiter

circuitry protects the driver from overpowering and

a response correction filter smoothes the frequency

response of the horn/driver combination. The driver

and equalization network provides for more reliable

operation, ensuring the show will go on.

2 hours of 6 db crest factor

pinknoise, 50 Hz - 20 kHz,

AES method

150 W RMS

Recommended Amplifier Power 300 W RMS maximum

Recommended Processing

Connectors

Subsonic filter below 30 Hz, > 18 dB per octave

LF-3115

HF-63X1

Barrier strip screw terminals

accept up to #10 AWG

stranded wire

Barrier strip screw terminals

accept up to #10 AWG

stranded wire

Transducers

One 15" (381mm) high efficiency,

extended bass woofer featuring a

3" copper voice coil

1.5" (38mm) exit, 2.5" titanium

diaphragm compression driver

Enclosure

Quasi B4 alignment, ported

Tilt/Pan Bracket

10° vertical tilt

10° horizontal pan

The LF-3115 15" (381mm) low-frequency enclosure

is designed specifically to address the extended low-

frequency response required for cinema applications.

The LF-3115 covers the frequency range from

35 Hz to 1000 Hz, depending upon the high-

frequency system requirements.

enclosure with fully flared ports,

symmetrical port design, tuned to

36 Hz, constructed of MDF and

heavily braced. Features vandal

resistant woofer mounting bolts

Dimensions (HWD)

18.5" x 30" x 20.3"

(470 mm x 762 mm x 516 mm)

16" x 30" x 20"

(406 mm x 762 mm x 508 mm)

The SC-312X is designed for ease of installation.

The HF-63X1 components come pre-assembled to

reduce field assembly time. Three bolts are all that

are required to secure the HF-63X1 to the top of the

LF-3115 enclosure.

Weight - Net

System Weight

Baffle Cut-Out

83 lbs (38 kg)

123 lbs (56.4 kg)

35.5" x 32"

40 lbs (18.4 kg)

1) Maximum input power tested in accordance with IEC 268-5 recommendations, 50 Hz - 20 kHz band limiting, 6 dB signal crest factor.

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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

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High Frequency Component

Introduction

The HF-63X1 and HF-63X2 are the high frequency components of full-range,

two-way screen channel loudspeaker systems for high performance cinema

applications. The HF-63X1 is designed specifically for use with QSC’s LF-

3115 low frequency loudspeaker and the HF-63X2 for the LF-3215 loud-

speaker.

The HF-63X1/X2 high-frequency system features a large format, 2.5”

(63.5mm) titanium diaphragm compression driver mounted on a custom

designed high-frequency cinema horn with an adjustable pan and tilt

bracket. The horn features broad horizontal and vertical coverage angles to

ensure coverage of every seat in the auditorium. The horn is a low-distortion

waveguide providing highly articulate dialogue without coloration associ-

ated with conventional horn loudspeakers. Equipped with a passive cross-

over providing tailored output for the LF-3115 or LF-3215, no additional

signal processing is required.

The HF-63X1/X2 components come pre-assembled to reduce field assembly

time. Three bolts are all that are required to secure the HF-63X1/X2 to the

top of a QSC low frequency loudspeaker. Threaded inserts in the LF enclo-

sures and matching punched hole pattern in the HF-63X1/X2 make mounting

to the low frequency enclosure simple.

Mounting

Refer to the illustration for mounting information. The HF-63X1/X2 attaches

to the top of the LF-3115 or LF-3215 with three 5/16-18 bolts, 0.75” long,

with lock washers. This hardware ships installed on the low frequency cabi-

net. We recommend the use of serviceable thread locking compound when

installing the bolts to prevent loosening due to vibration. Aim the horn in the

horizontal plane (pan) before tightening. Adjust the vertical tilt with the

bracket adjustment.

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. Ser-

vicing 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, cab-

inets, 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, profes-

sional engineer when any doubt or questions arise regarding

a physical equipment installation.

*TD-000219-00*

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

TD-000219-00 rev.A

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Connections

The HF-63X1/X2 has barrier strip screw terminals that accept up to #10 AWG (5.3mm ) stranded loudspeaker wire.

INPUT Terminals

Connect the amplifier’s full range output signal to the HF-63X1 or HF-63X2 INPUT terminals. Observe proper polarity; the amplifier’s + signal to

the HF-63X1 or HF-63X2 + INPUT, the amplifier’s - signal to the HF-63X1 or HF-63X2 - INPUT. Use the largest wire size and shortest wire

length for the application.

HF OUT Terminals

The HF OUT terminals are factory-connected to the compression driver. These terminals should ONLY be connected to the HF-63X1 or HF-63X2

compression driver. Observe proper polarity; the + HF OUT signal to the compression driver’s + input, the - HF OUT signal to the compression

driver’s - input.

LF OUT Terminals

The HF-63X1 is designed specifically for use with QSC’s LF-3115 low frequency loudspeaker and the HF-63X2 for the LF-3215 loudspeaker. The

LF OUT terminals are factory-terminated to lead wires with spade-lugs. These should ONLY be connected to QSC’s model LF-3115 or model LF-

3215 low frequency loudspeaker. Observe proper polarity; connect the + LF OUT signal to the low frequency loudspeaker’s + input, the - LF

OUT signal to the low frequency loudspeaker’s - input.

HF-63X1 or HF63X2

Compression

Driver

The HF-63X1 is designed

specifically for use with

QSC’s LF-3115 low fre-

quency loudspeaker and

the HF-63X2 for the LF-3215

loudspeaker.

To LF-3115 or LF-3215

HF OUT connection ter-

minals. Connect to HF-

63X1 or HF-63X2 com-

pression driver.

LF OUT connection

terminals. Connect to

LF-3115 or LF 3215

loudspeaker INPUT

terminals.

HF-63X1 or HF-63X2

INPUT connection

terminals

Amplifier

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HF-63X1 and HF-63X2 Specifications (subject to change without notice)

Frequency Range:

1,300 - 16,000 Hz (-6 dB)

Nominal Coverage:

90° horizontal X +15 to -35° vertical (50° total, adjustable mount provides for vertical plane adjustments. The hori-

zontal plane can be adjusted by altering mounting position on the low frequency enclosure before tightening bolts.

DI:

9.0 dB (600 to 16,000 Hertz average)

8.0 (600 to 16,000 Hertz average)

SPL (peak):

HF-63X1 with LF-3115: 123 dB

HF-63X2 with LF-3215: 126 dB

Impedance:

HF-63X1 with LF-3115: 8 Ohms nominal

HF-63X2 with LF-3215: 4 Ohms nominal

Maximum Input Power:

(2 hours EIA 426B)

HF-63X1 with LF-3115: 150 W

HF-63X2 with LF-3215: 300 W

Sensitivity:

HF-63X1 with LF-3115: 95.0 dB

HF-63X2 with LF-3215: 97.5 dB

Crossover Frequency:

Connectors:

1,300 Hz

Barrier strip screw terminals accept up to #10 AWG stranded wire. Six terminals: Two full-range input terminals,

two HF OUT terminals (factory wired to compression driver), and two LF OUT terminals with factory supplied wiring

for connection to QSC LF-3115 or LF-3215 low frequency loudspeaker.

Transducers:

Mounting Hardware:

Size:

1.5” (38mm) exit, 2.5” (63.5mm) titanium diaphragm compression driver.

Attaches to top of the LF-3115 or LF-3215 low frequency cabinet using three 5/16”-18 x 3/4” long bolts.

30” wide X 16” high X 20” deep (762mm X 406mm X 508mm)

Weight:

50 lbs. (shipping), 40 lbs. (net), 22.7/18.4 kilograms

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Warranty (USA only; other countries, see your dealer or distributor)

Disclaimer

QSC Audio Products, Inc. is not liable for any damage to amplifiers, or any other equipment that is caused by negligence or

improper installation and/or use of this loudspeaker product.

QSC Audio Products 3 Year Limited Warranty

QSC Audio Products, Inc. (“QSC”) guarantees its products to be free from defective material and / or workmanship for a period

of three (3) years from date of sale, and will replace defective parts and repair malfunctioning products under this warranty

when the defect occurs under normal installation and use - provided the unit is returned to our factory or one of our authorized

service stations via pre-paid transportation with a copy of proof of purchase (i.e., sales receipt). This warranty provides that

the examination of the return product must indicate, in our judgment, a manufacturing defect. This warranty does not extend

to any product which has been subjected to misuse, neglect, accident, improper installation, or where the date code has been

removed or defaced. QSC shall not be liable for incidental and/or consequential damages. This warranty gives you specific

legal rights. This limited warranty is freely transferable during the term of the warranty period.

Customer may have additional rights, which vary from state to state.

In the event that this product was manufactured for export and sale outside of the United States or its territories, then this lim-

ited warranty shall not apply. Removal of the serial number on this product, or purchase of this product from an unauthorized

dealer, will void this limited warranty. Periodically, this warranty is updated. To obtain the most recent version of QSC’s war-

ranty statement, please visit www.qscaudio.com. Contact us at 800-854-4079 or visit our website at www.qscaudio.com.

Contacting QSC Audio Products

Mailing address:QSC Audio Products, Inc.

1675 MacArthur Boulevard

Costa Mesa, CA 92626-1468 USA

Telephone Numbers:

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

Facsimile Numbers:

Sales & Marketing Fax(714) 754-6174

Customer Service Fax(714) 754-6173

World Wide Web:www.qscaudio.com

E-mail:[email protected]

[email protected]

QSC Audio Products, Inc. 1675 MacArthur Boulevard Costa Mesa, California 92626 USA

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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

Cinema Loudspeaker Systems User Manual

LF-3115

Low Frequency Loudspeaker

Introduction

The LF-3115 15” (381mm) low frequency enclosure is designed specifically for cinema appli-

cations. Meeting cinema requirements for extended low frequency response differentiates

the LF-3115 from more conventional “rock-and-roll” woofer systems. The LF-3115 covers the

frequency range from 33 Hertz to 1900 Hertz, depending upon the high frequency system

requirements.

The 300 watt, 15” transducer is well suited for cinema use. It features a 3” (76mm) voice

coil, ceramic magnet, and a multi-vented pole piece to ensure cool operation. Cooler temper-

atures increase transducer lifespan and decrease the problem of power compression at high

power levels. The suspension and voice coil of the transducer have been designed to provide

low distortion and high impact bass at high power.

The enclosure is constructed of high quality medium density fiberboard panels with stiffen-

ing braces on all panels. Both internal and external port openings are fully radiused ensuring

smooth air flow at higher power levels, preventing audible port turbulence. The stiffening

braces reduce panel resonance.

Mounting points for

high frequency system

Bass ports are evenly spaced on each side of the transducer, making internal pressure more

uniform across the back surface of the transducer. This prevents the cone from being dis-

placed to one side or another by unbalanced forces, reducing the chance of driving the voice

coil out of the center of the gap at high power.

Three T-nuts in the top of the enclosure provide easy mounting of QSC high frequency sys-

tems, such as the HF-63.

Enclosure is not designed to be suspended, flown, or rigged. Do not sus-

pend, fly, or rig this enclosure.

This product is capable of producing sound pressure levels that can perma-

nently damage human hearing. Always keep sound pressure levels in the

listening area below levels that can damage human hearing.

Install in accordance with QSC Audio Product’s instructions and a

licensed, professional engineer. Only use attachments, mounts, accesso-

ries, 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 installa-

tion.

*TD-000172-00*

TD-000172-00 rev.C

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

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Connections

Normal Connection Example:

Normal Connection

The LF-3115 has barrier strip screw termi-

nals for connection. The terminals accept

Amplifier capable of

driving 8 ohm loads

up to #10 AWG (5.3mm ) stranded loud-

speaker wiring. Use the largest wire size

and shortest wire length possible for a

given installation. Observe the polarity

markings and keep polarity consistent

throughout the system for best perfor-

mance.

Parallel Connection Example:

Parallel Connection of Second LF-3115

The terminals marked OUTPUT may be

used to connect another LF-3115 in paral-

lel. Connect the wires as shown in the illus-

tration, at right.

Amplifier capable of

driving 4 ohm loads

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LF-3115 Specifications (subject to change without notice)

Frequency Range:

33 - 1900 Hertz (-6dB)

30 - 3200 Hertz useable range (-10dB)

Nominal Coverage:

Maximum Output:

100° horizontal X 100° vertical at 1000 Hertz

126.5dB SPL calculated peak, 1 meter, half space, at rated rms power with 6 dB crest factor pink noise input, 35 - 1000 Hertz.

120.5dBA SPL calculated maximum continuous, 1 meter. The dBA scale is typically used to identify sound sources

which can cause permanent hearing loss.

Impedance:

8 ohms nominal

8 ohms minimum, 160 Hertz

90 ohms maximum, 22 Hertz

Maximum Input Power:

300 watts rms (8 hours of 6dB crest factor pink noise, 40 - 400 Hertz)

375 watts rms (2 hours of 6dB crest factor pink noise, 40 - 400 Hertz)

Recommended amplifier power capability- 600 watts rms maximum into 8 ohms (per LF-3115)

Sensitivity:

95.5dB half space, 94.0dB full space, 35 - 1000 Hertz, 1 watt, 1 meter

Recommended Processing:

Subsonic filter below 30 Hertz, >18 dB per octave, maximum recommended crossover frequency is 1000 Hertz. QSC

DSP configurations are available at www.qscaudio.com. Parameters for alternative processing hardware are available

upon request.

Connectors:

Transducers:

Enclosure:

Barrier strip screw terminals accept up to #10 AWG (5.3mm ) stranded wire. Four terminals: (two INPUT and two par-

allel OUTPUT).

15” (381mm) high efficiency low frequency transducer featuring vented 3” (76mm) copper voice coil on Kapton® form-

ers. High excursion/low distortion design, with extremely high power handling, and low thermal and port compression.

Quasi B4 alignment, ported enclosure with fully flared ports, low turbulence symmetrical port design, tuned to 36

Hertz, constructed of medium density fibreboard and heavily braced. Features vandal resistant woofer mounting bolts.

Size:

30” wide X 18” high X 20” deep (762mm X 457mm X 508mm)

96 lbs. shipping, 83 lbs. net (44/38 kg.)

Weight:

SPL and Impedance vs. Frequency

SPL 2pi

SPL 4pi

Impedance

Frequency (Hertz)