SC-412 - Speaker QSC - Free user manual and instructions

USER MANUAL SC-412 QSC

• Two-way, bi-amplified screen channel system
• SC-412 provides 90^ horizontal by +20^ to -30^ vertical coverage
• Low-distortion waveguides provide highly articulate dialogue
• Shallow depth (20") facilitates installation

Exterior view of a black speaker with a triangular roof and two speakers (no text or symbols visible)

Developed specifically for the unique requirements of professional motion picture playback, the SC-412 extends QSC's commitment to the cinema market. As a member of the DCS Digital Cinema Speaker Series, the SC-412 is a two-way, bi-amplified screen channel loudspeaker system comprised of two main units—the HF-75 high-frequency system and the LF-4115 low-frequency system.

The HF-75 high-frequency system features a 3" large format (75mm) titanium diaphragm compression driver mounted on a custom designed high-frequency cinema horn with an adjustable pan and tilt bracket. The HF-75 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.

The LF-4115 15" (381mm) low-frequency enclosure is designed specifically to address the extended low-frequency response required for cinema applications. The LF-4115 covers the frequency range from 35 Hz to 1000 Hz, depending upon the high-frequency system requirements.

The SC-412 is designed for ease of installation. The HF-75 components come pre-assembled to reduce field assembly time. Three bolts are all that are required to secure the HF-75 to the top of the LF-4115 enclosure.

Specifications SC-412

Nominal Coverage	90° horizontal x +20 to -30° vertical
Frequency Range	33 Hz - 16 kHz (-6 dB)
Crossover Frequency	700 Hz, 24 dB per octave
	LF-4115	HF-75
Impedance	4Ω	8Ω
Sensitivity 1 watt/1 meter, half space	93.5 dB	107.5 dB
Maximum Input Power ^1
8 hours of 6 db crest factor IEC 268 noise spectrum	400 W RMS	60 W RMS
2 hours of 6 db crest factor pink noise, 50 Hz - 20 kHz, AES method	500 W RMS	80 W RMS
Recommended Amplifier Power	800 W RMS maximum	100 W RMS maximum
Recommended Processing	Subsonic filter below 30 Hz, >18 dB per octave	4th order LR crossover at 700 Hz
Connectors	Barrier strip screw terminals accept up to #10 AWG stranded wire, four terminals; two inputs and two parallel outputs	Barrier strip screw terminals accept up to #10 AWG stranded wire, four terminals; two inputs and two parallel outputs
Transducers	One 15" (381mm) high efficiency, extended bass woofer featuring a 4" copper voice coil	1.5" (38mm) exit, 3" titanium diaphragm compression driver
Enclosure	Quasi B4 alignment, ported enclosure with fully flared ports, symmetrical port design, tuned to 36 Hz, constructed of MDF and heavily braced. Features vandal resistant woofer mounting bolts	Tilt/Pan Bracket ±10° vertical tilt ±10° horizontal pan
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)
Weight - Net	83 lbs (38 kg)	40 lbs (18.4 kg)
System Weight	123 lbs (56.4 kg)
Baffle Cut-Out	35.5" x 32"

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

Specifications subject to change without notice.

Cinema Loudspeaker Systems User Manual

HF-75 High Frequency Component

Introduction

The HF-75 is the high frequency component of the SC-412 and SC-422 two-way, biamplified screen channel loudspeakers for high performance cinema applications. The system is shipped as two separate components: the HF-75 high frequency system and the LF-4115 or LF-4215 woofer system.

The HF-75 high-frequency system features a large format, 3" (75mm) 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 the "honky" coloration associated with conventional horn loudspeakers.

The HF-75 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 over-powering 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.

The HF-75 components come pre-assembled to reduce field assembly time. Three bolts are all that are required to secure the HF-75 to the top of the low frequency enclosure.

Mounting

Refer to the illustration for mounting information. The HF-75 attaches to the top of the LF-4115 or LF-4215 with three 5/16-18 bolts, 0.75" long, with lock washers. 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. 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.

Connections

The HF-75 has barrier strip screw terminals that accept up to #10 AWG stranded loudspeaker wire.

HF INPUT Terminals

Connect the amplifier's output signal to the loudspeaker's HF INPUT terminals. Observe proper polarity; amplifier + signal to loudspeaker + HF INPUT, amplifier - signal to loudspeaker - HF INPUT. Use the largest wire size and shortest length for the application.

NOTE! Do not apply full range signal to the HF-75! There is no crossover in the HF-75, only a compensation/delay network. All required signal processing must be done upstream of the HF-75. Maintain proper loud-speaker connection polarity throughout the entire system for maximum performance.

HF OUTPUT Terminals

The HF OUTPUT terminals are factory-connected to the compression driver. These terminals should ONLY be connected to the HF-75's compression driver.

QSC DCM or other active crossover Amplifier Processed high frequency program signal HF-75 connection terminals HF-75 connection driver Note: The HF-75 connection enclosure does not contain a crossover network! Ensure only high frequency signal is applied to HF INPUT terminals or compression driver damage will occur.

Note: The HF-75 connection enclosure does not contain a crossover network! Ensure only high frequency signal is applied to HF INPUT terminals or compression driver damage will occur.

HF-75 Specifications (subject to change without notice)

Frequency Range: 600 - 16kHz (-6 dB, full space)

Nominal Coverage:

90^ horizontal X + 15^ to -35^ vertical (50° total, adjustable mount provides for vertical plane adjustments. The horizontal plane can be adjusted by altering mounting position on the LF-4215 enclosure before tightening bolts.

DI: 9.0 dB (600 to 16,000 Hertz average)

Q: 8.0 (600 to 16,000 Hertz average)

Maximum Output: 133 dB SPL calculated peak, 1 meter, half space.

Impedance: 8 ohms nominal

8.0 ohms minimum at 3,000 Hertz

104 ohms maximum at 475 Hertz

Maximum Input Power:

60 watts rms (100 hours of 6 dB crest factor pink noise, 500 to 20,000 Hertz, IEC method)

80 watts rms (2 hours of 6 dB crest factor pink noise, 60 - 6,000 Hertz, AES method)

Sensitivity: 108 dB half space, 1 watt, 1 meter

Crossover Frequency: 700 Hertz or higher, 24 dB per octave

Connectors:

Barrier strip screw terminals accept up to #10 AWG stranded wire. Four terminals: (two HF INPUT and two post compensation HF OUTPUT). HF OUTPUT factory wired to compression driver.

Transducers: 1.5" (38mm) exit, 3.0" (76mm) titanium diaphragm compression driver.

Mounting Hardware:

Attaches to top of low frequency cabinet using three 5/16"-18 x 3/4" long bolts.

Size: 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

SPL and Impedance vs. Frequency

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 limited 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 warranty 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 [phone]

Sales & Marketing [phone] or toll free (USA only) [phone]

Customer Service(714) 957-7150 or toll free (USA only) [phone]

Facsimile Numbers:

Sales & Marketing Fax[phone]

Customer Service Fax[phone]

World Wide Web: www.qscaudio.com

E-mail:[e-mail]

[e-mail]

Cinema Loudspeaker Systems User Manual

LF-4115 Low Frequency Loudspeaker

Introduction

The LF-4115 15" (381mm) low frequency enclosure is designed specifically for cinema applications. Meeting cinema requirements for extended low frequency response differentiates the LF-4115 from more conventional "rock-and-roll" woofer systems. The LF-4115 covers the frequency range from 33 Hertz to 1200 Hertz, depending upon the high frequency system requirements.

The custom 400 watt, 15" transducer was developed specifically for cinema use. It features a 4" (100mm) voice coil, 120 oz.(3.4kg) ceramic magnet, and a multi-vented pole piece to ensure cool operation. Cooler temperatures increase transducer lifespan and decrease the problem of power compression at high power levels. An undercut pole piece ensures the voice coil operates in a symmetrical magnetic gap, reducing second order harmonic distortion. 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 stiffening braces on all six panels. Both internal and external port openings are fully radiused ensuring smooth air flow at higher power levels, preventing audible port turbulence.

Bass ports are symmetrically 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 displaced 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's HF-75 high frequency system, or MH-1063 mid-high system.

Enclosure is not designed to be suspended, flown, or rigged. Do not suspend, fly, or rig this enclosure.

This product is capable of producing sound pressure levels that can permanently 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, 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.

Isometric line drawing of a rectangular electronic device with circular and rectangular cutouts (no text or symbols)

Mounting points for high or mid-high frequency system

30" (762mm)

4" (102mm) 18" (457mm) 10" (254mm) 20" (508mm)

Connections

Normal Connection

The LF-4115 has barrier strip screw terminals for connection. The terminals accept up to #10 AWG (5.3mm ^2 ) stranded loudspeaker 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 performance.

Normal Connection Example:

Amplifier capable of driving 4 ohm loads - + - + INPUT OUTPUT NOTE OUTPUT TERMINALS PROVIDED FOR CONNECTING SPEAKERS IN PARALLEL. CHECK AMPLIFIER SPECIFICATIONS FOR MINIMUM RATED IMPEDANCE. QSC

Parallel Connection of Second LF-4115

The terminals marked OUTPUT may be used to connect another LF-4115 in parallel. Connect the wires as shown in the illustration, at right.

Parallel Connection Example:

Amplifier capable of driving 2 ohm loads NOTE OUTPUT TERMINALS PROVIDED FOR CONNECTING SPEAKERS IN PARALLEL. CHECK AMPUER SPECIFICATIONS FOR MINIMUM RATED IMHDANCE. QSC NOTE OUTPUT TERMINALS PROVIDED FOR CONNECTING SPEAKERS IN PARALLEL. CHECK AMPUER SPECIFICATIONS FOR MINIMUM RATED IMHDANCE. QSC

LF-4115 Specifications (subject to change without notice)

Frequency Range: 33 - 1200 Hertz (-6dB)

29 - 3000 Hertz useable range (-10dB)

Nominal Coverage: 100° horizontal X 100° vertical at 1000 Hertz

Maximum Output:

127.0dB SPL calculated peak, 1 meter, half space, at rated rms power with 6 dB crest factor pink noise input, 35 - 1000 Hertz.

121.0dBA SPL calculated maximum continuous, 1 meter. The dBA scale is typically used to identify sound sources which can cause permanent hearing loss.

Impedance: 4 ohms nominal

4.3 ohms minimum, 160 Hertz

40 ohms maximum, 22 Hertz

Maximum Input Power:

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

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

recommended amplifier power capability- 1100 watts rms maximum into 4 ohms (per LF-4115)

Sensitivity: 93.5dB half space, 92.0dB 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: Barrier strip screw terminals accept up to #10 AWG (5.3mm allel OUTPUT).

^2 ) stranded wire. Four terminals: (two INPUT and two par-

Transducers:

15" (381mm) high efficiency low frequency transducer featuring vented 4" (100mm) copper voice coil on Kapton® formers. High excursion/low distortion design, with extremely high power handling, and low thermal and port compression.

Enclosure:

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)

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

SPL and Impedance vs. Frequency

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 limited 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 warranty 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 [phone]

Sales & Marketing [phone] or toll free (USA only) [phone]

Customer Service(714) 957-7150 or toll free (USA only) [phone]

Facsimile Numbers:

Sales & Marketing Fax[phone]

Customer Service Fax[phone]

World Wide Web:www.qscaudio.com

E-mail:[e-mail]

[e-mail]

Technical line drawing of a mechanical assembly with a pulley and housing (no text or symbols)

21" (533mm) 30" (762mm)

16" (406mm)

20" (508mm)

Conexiones

[e-mail]

Isometric line drawing of a rectangular electronic device with circular and rectangular cutouts (no text or symbols)

30" (762mm)

4" (102mm) 18" (457mm) 10" (254mm) 20" (508mm)

Conexiones

Conexión normal

[e-mail]

Technical line drawing of a mechanical assembly with no visible text or symbols

21" (533mm) 30" (762mm)

16" (406mm)

20" (508mm)

Branchements

Adresse postale : QSC Audio Products, Inc.

1675 MacArthur Boulevard

[e-mail]

Isometric line drawing of a rectangular electronic enclosure with circular cutouts and mounting holes (no text or symbols)

30" (762mm)

4" (102mm) 18" (457mm) 10" (254mm) 20" (508mm)

Branchements

Branchement normal

Adresse postale : QSC Audio Products, Inc.

1675 MacArthur Boulevard

[e-mail]

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

[e-mail]

Isometric line drawing of a rectangular electronic device with circular and rectangular cutouts (no text or symbols)

30" (762mm)

4" (102mm) 18" (457mm) 10" (254mm) 20" (508mm)

Verbindungen

Normaler Anschluss

[e-mail]

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

Technical line drawing of a mechanical assembly with no visible text or symbols

21" (533mm) 30" (762mm)

16" (406mm)

20" (508mm)

连接

[e-mail]

影院扬声器系统用户手册

LF-4115 低频扬声器

简介

Isometric line drawing of a rectangular electronic device with circular and rectangular cutouts (no text or symbols)

30" (762mm)

4" (102mm) 18" (457mm) 10" (254mm) 20" (508mm)

连接

正常连接

[e-mail]

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