LF-4215-8F Cinema Loudspeaker User Manual Low–Frequency Loudspeaker TD-000295-00-A *TD-000295-00*
IMPORTANT SAFETY PRECAUTIONS AND EXPLANATION OF SYMBOLS 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 or placement. Any such condition severely reduces the safety of the installation and should be immediately corrected.
Introduction The LF-4215-8F dual 15" (381 mm) low-frequency enclosure is designed specifically for large format cinema applications. Meeting cinema requirements for extended low-frequency response differentiates the LF-4215-8F from more conventional “rock-and-roll” woofer systems. The LF-4215-8F covers the frequency range from 35 Hertz to 1000 Hertz, depending upon the high-frequency system requirements.
Suspension The LF-4215-8F enclosure features 16 load-rated attachment points. As shipped from the factory, each attachment point has a bolt installed to retain the air-tight design of the enclosure. Never operate the loudspeaker with the attachment points open (unsealed) as it will degrade the performance of the product. The LF-4215-8F and MHV-1090F have the exact same external dimensions and attachment points.
Connections Normal Connection Amplifier connections to the LF-4215-8F are made on the rear panel via a Neutrik NL4P SpeakonTM connector supplied by the installer. This connector provides power to both woofers of the LF-4215-8F via the 1+ and 1- terminals. The woofers are internally wired in parallel. Pre-made Speakon cables using high grade, 2 or 4 conductor stranded wire are readily available from a number of suppliers and is highly recommended.
SPL and Impedance vs. Frequency SPL (dB) Impedance Ohms SPL 2 Pi (half space) Impedance Frequency (Hertz) Dimensions 2 x 3" (2 x 76.2 mm) 2 x 13" (2 x 330.2 mm) 2 x 37" (2 x 939.8 mm) 31.5" (800.1 mm) Front 19" (482.6 mm) Side 5 40" (1016 mm) 2 x 1.5" 2 x 38.1 mm 2 x 28.5" 2 x 723.9 mm 31.5" 800.
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