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Cinema Loudspeaker Systems User Manual

LF-4315Low Frequency Loudspeaker

Introduction

The LF-4315 15” (381mm) low frequency enclosure is designed specifically for cinema appli- cations. Meeting cinema requirements for extended low frequency response differentiates the LF-4315 from more conventional “rock-and-roll” woofer systems. The LF-4315 covers the frequency range from 30 Hertz to 500 Hertz, depending upon the high frequency system requirements.

The three custom 400 watt, 15” transducers were developed specifically for cinema use. They feature 4” (100mm) voice coils, 120 oz.(3.4kg) ceramic magnets, and multi-vented pole pieces to ensure cool operation. Cooler temperatures increase transducer lifespan and decrease power compression at high power levels. Undercut pole pieces ensure the voice coils operate in symmetrical magnetic gaps, reducing second order harmonic distortion. The suspension and voice coils of the transducers 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.

Bass ports are symmetrically spaced on each side of the transducers, making internal pres- sure more uniform across the back surface of the transducers. This prevents the cones from being displaced to one side or another by unbalanced forces, reducing the chance of driving the voice coils out of the center of the gaps 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.

Mounting points for high or 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-000177-00*

TD-000177-00 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-4315Low Frequency Loudspeaker Introduction, MacArthur Blvd., Costa Mesa, CA, 92626 USA

LF-4315 specifications

The QSC Audio LF-4315 is a powerful and versatile loudspeaker designed for professional audio applications. Ideal for live sound reinforcement, it is particularly well-suited for music venues, theaters, and outdoor events where deep, impactful bass is essential. This model stands out due to its engineered design and advanced technology, ensuring superior performance in various settings.

A notable feature of the LF-4315 is its dual 15-inch low-frequency drivers. These drivers are designed to deliver exceptional bass response and handling, further enhanced by a robust enclosure that minimizes distortion. The LF-4315 promotes efficient sound dispersion, allowing it to fill larger spaces with a rich, full-bodied sound. This is crucial in live environments where maintaining clarity and power across the frequency spectrum is vital.

The LF-4315 utilizes advanced construction materials, contributing to its durability and longevity. The cabinet is made from high-quality plywood, which not only reduces weight for easier transport but also enhances acoustic performance. Additionally, the rugged exterior ensures it can withstand the rigors of touring or installation in various venues.

One of the standout technologies in the LF-4315 is its precision-engineered porting system. This design reduces turbulence and improves airflow, leading to a more efficient bass response. The result is a clean, punchy low end that complements the rest of the audio spectrum without overwhelming it.

Flexibility is key with the LF-4315, as it is designed for both single and dual-use configurations. It can be easily integrated into existing sound systems or used in conjunction with other QSC products to create a comprehensive audio setup. This versatility makes it a popular choice among sound engineers and venue operators alike.

In terms of connectivity, the LF-4315 features standard audio connections that ensure compatibility with a wide range of amplifiers and processors. This ease of integration further solidifies its status as a go-to option for professionals looking to achieve exceptional sound quality without compromising on reliability.

The QSC Audio LF-4315 is a remarkable loudspeaker that combines advanced engineering with practical design. Its main features include dual 15-inch drivers, high-quality cabinet construction, and a sophisticated porting system, all of which contribute to its powerful performance in live sound environments. Whether for a permanent installation or a mobile sound setup, the LF-4315 demonstrates QSC's commitment to delivering unparalleled audio quality.