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QSC Audio user manual LF-4115Low Frequency Loudspeaker Introduction

Models: LF-4115

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1675 MacArthur Blvd., Costa Mesa, CA, 92626 USA

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Cinema Loudspeaker Systems User Manual

LF-4115Low Frequency Loudspeaker

Introduction

The LF-4115 15” (381mm) low frequency enclosure is designed specifically for cinema appli- cations. 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 distor- tion. The suspension and voice coil of the transducer have been designed to provide low dis- tortion and high impact bass at high power.

The enclosure is constructed of high quality medium density fiberboard panels with stiffen- ing 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 pres- sure 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-1063 mid-high system.

Mounting points for high or mid-high frequency 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-000171-00*

TD-000171-00 rev.C © Copyright 2004, QSC Audio Products, Inc.

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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QSC Audio user manual LF-4115Low Frequency Loudspeaker Introduction, MacArthur Blvd., Costa Mesa, CA, 92626 USA
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LF-4115 specifications

The QSC Audio LF-4115 is a significant development in the realm of professional audio, particularly notable for its performance in low-frequency applications. Designed for concert venues, clubs, and other live sound applications, it promises to deliver robust bass response, meeting the demands of both musicians and sound engineers alike.

One of the standout features of the LF-4115 is its high-efficiency woofer, engineered to provide exceptional sound quality. The LF-4115 employs a 15-inch, cone driver that is purpose-built for low-frequency reproduction. With a power handling capacity of up to 800 watts continuous and 3200 watts peak, this subwoofer ensures that even the most powerful sound systems can achieve the deep, resonating bass that audiences expect.

Technologically, the LF-4115 utilizes state-of-the-art design principles. It features a bass-reflex enclosure, allowing for an optimized airflow that enhances the speaker’s overall performance. This design minimizes distortion and maximizes output, producing clear and powerful low frequencies that can fill large spaces. The cabinet is constructed from durable birch plywood, providing not only strength and stability but also acoustic properties that support excellent performance.

The LF-4115 is also equipped with a dual port design, which further aids in achieving the desired low-end extension and response. This feature helps to reduce air turbulence, ensuring cleaner bass notes even at high volumes. Additionally, the subwoofer includes built-in handles for easy transport and setup, making it a practical choice for touring professionals.

In terms of connectivity, the LF-4115 is versatile enough to integrate seamlessly with a variety of sound systems. It comes with dual Neutrik Speakon inputs, allowing for secure connections and daisy-chaining with other subwoofers or speakers. This flexibility makes the LF-4115 an attractive option for users looking to customize their audio environments.

Overall, the QSC Audio LF-4115 excels in providing high-quality low-frequency sound reproduction, making it a valuable asset for both live sound applications and fixed installations. With its powerful woofer, robust construction, and intelligent design, the LF-4115 stands as a testament to QSC's commitment to audio excellence, catering to the needs of professionals in the industry.