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*TD-000141-00*

Cinema Loudspeaker Systems User Manual

LF-4215 Low Frequency Loudspeaker

Introduction

The LF-4215 dual 15” (381mm) low frequency enclosure is designed specifically for cinema

applications. Meeting cinema requirements for extended low frequency response differenti-

ates the LF-4215 from more conventional “rock-and-roll” woofer systems. The LF-4215 cov-

ers the frequency range from 35 Hertz to 1000 Hertz, depending upon the high frequency

system requirements. Close Coupled Woofers (CCW), with its tight spacing between woof-

ers, improves coupling and keeps coverage angles wide over a greater frequency range than

more widely spaced designs.

The two custom 400 watt, 15” transducers were developed especially for cinema use. They

feature extremely large 4” (100mm) voice coils and a multi-vented pole piece to ensure cool

operation, even at high power levels. Cooler temperatures increase transducer lifespan and

decrease the problem of power compression at high power. An undercut pole piece ensures

the voice coil operates in a Symmetrical Magnetic Gap (SMG), reducing second harmonic

distortion.

The enclosure is constructed of high quality MDF panels and features Single Woofer Cham-

bers (SWC, separate chambers for each transducer). In the rare event of a transducer failure,

this prevents over-excursion of the remaining transducer caused by improper box loading.

Large, Fully Radiused Ports (FRP) ensure smooth air flow through the ports, especially at

higher power. This prevents potentially audible port turbulence noise. Both internal and

external port openings are fully radiused.

With Symmetrical Port Loading (SPL), bass ports are evenly spaced on each side of the trans-

ducers, 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 fre-

quency system, or MH-1075 mid-high system.

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-000141-00 rev.D

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

Mounting points for high

or mid-high system

1 2 3 4 5 6 ... 19 20

Inhaltsverzeichnis

Seite 1 - *TD-000141-00*

*TD-000141-00*Cinema Loudspeaker Systems User ManualLF-4215 Low Frequency LoudspeakerIntroductionThe LF-4215 dual 15” (381mm) low frequency enclosure

Seite 2 - Connections

BranchementsBranchement normalLe branchement du LF-4215 se fait à partir de bornes vissables de bornier à cloisons. Les bornes acceptent des câbles de

Seite 3

Caractéristiques techniques du LF-4215 (sujettes à modification sans préavis)Plage de fréquence : 38 à 1 300 Hz (±3 dB) 30 à 1 400 Hz (plage utile) (-

Seite 4 - Contacting QSC Audio Products

Garantie (États-Unis seulement ; dans les autres pays, consulter le revendeur ou le distributeur)Avis de non-responsabilitéQSC Audio Products, Inc. n&

Seite 5 - Introducción

Kinolautsprecheranlagen - BenutzerhandbuchNiederfrequenzlautsprecher LF-4215EinführungDas Gehäuse des LF-4215-Lautsprechers mit zwei 15-Zoll- (381-mm-

Seite 6 - Conexiones

VerbindungenNormaler AnschlussDas Modell LF-4215 wird über Barrier-Strip-Schraubklemmen angeschlossen. Die Klemmen können Lautsprecher-Litzendraht bis

Seite 7

LF-4215 - Technische Daten (können jederzeit ohne vorherige Mitteilung geändert werden)Frequenzbereich: 38 Hz - 1300 Hz (±3 dB) Nutzbereich 30 - 1400

Seite 8

Garantie (nur für die USA; wenden Sie sich zwecks Garantieinformationen für andere Länder an Ihren Händler oder Distributor)HaftungsausschlussQSC Audi

Seite 9 - LF-4215

影院扬声器系统用户手册LF-4215 低频扬声器简介LF-4215 双 15” (381 毫米 ) 的低频机壳专为影院应用设计。LF-4215 和传统 “摇滚”低音系统的不同之处在于它可以满足影院对扩展低频响应的要求。根据高频系统的要求，LF-4215 可覆盖 35 赫兹到 1000 赫兹的频率范围

Seite 10 - Branchements

连接正常连接LF-4215 具有用于连接的阻挡带螺旋式终端。此终端接受高达 #10AWG的绞合式扬声器电线。对于特定的安装，尽可能使用最大电线尺寸和最短电线长度。观察极性标志，确保整个系统极性一致，以便获得最佳表现。第二个 SB-5218 并联终端标志 SPK2 可用于并联另一个LF-4215。按照

Seite 11

LF-4215 产品规格 ( 如有改变恕不另行通告 )频率范围： 38 - 1300赫兹(±3 dB) 30 - 1400 赫兹可用范围 (-10 dB)标称覆盖范围： 600 赫兹时 100°水平 X 55°垂直最大输出：134.5 dB SPL 计算峰值、1 米、半间距、在额定 rms 功率

Seite 12

ConnectionsNormal ConnectionThe LF-4215 has barrier strip screw termi-nals for connection. The terminals accept up to #10 AWG stranded loudspeaker wir

Seite 13 - LF-4215

保修（仅限美国；其它国家，请联系您的经销商或分销商）声明QSC Audio Products, Inc. 不承担因疏忽、或不当安装和 / 或不当使用本放大器产品而对扬声器或任何其它设备造成损坏的任何责任。QSC Audio Products3 年有限质保协议。QSC Audio Products,

Seite 14 - Verbindungen

LF-4215 Specifications (subject to change without notice)Frequency Range: 38 - 1300 Hertz (±3 dB) 30 - 1400 Hertz useable range (-10 dB)Nominal Covera

Seite 15

Warranty (USA only; other countries, see your dealer or distributor)DisclaimerQSC Audio Products, Inc. is not liable for any damage to amplifiers, or

Seite 16

Manual del usuario de los sistemas de altavoces para salas de cineAltavoz de baja frecuencia LF-4215IntroducciónLa caja doble de baja frecuencia de 15

Seite 17 - LF-4215 低频扬声器

ConexionesConexión normalEl altavoz LF-4215 tiene terminales de tor-nillo de barra protectora para su conexión. Los terminales aceptan cableado trenza

Seite 18

Especificaciones del sistema LF-4215 (sujetas a cambio sin previo aviso)Intervalo de frecuencias: 38 - 1300 Hertzios (±3 dB) Intervalo utilizable de

Seite 19 - LF-4215 产品规格 ( 如有改变恕不另行通告 )

Garantía (sólo para EE.UU.; para otros países, consulte con su vendedor o distribuidor)Renuncia de responsabilidadQSC Audio Products, Inc. no es respo

Seite 20 - 联系 QSC Audio Products

Manuel d'utilisation de systèmes de haut-parleurs de cinéma Haut-parleur basse fréquence LF-4215 IntroductionL'enceinte basse fréquence doub