3
TD-000512-00-A
EN
Introduction
The SB-2180 is a specially designed cinema subwoofer, featuring dual 18”
(460 mm), low-frequency transducers, mounted in a ported enclosure. The
enclosure is tuned to 29 Hz.
The two custom 18” transducers were developed especially for cinema use.
The woofers feature 4” (100 mm) voice coils and vented pole pieces to ensure
cool operation, even at high power levels. Cooler temperatures increase driver
lifespan and decrease problematic power compression at high drive levels.
Undercut pole pieces provides a Symmetrical Magnetic Gap (SMG), reducing
second harmonic distortion.
Enclosures are constructed of high quality MDF panels and feature Single
Woofer Chambers (SWC). The separate chamber for each transducer makes
the enclosure stronger, provides rigidity, and prevents cone over-excursion
in the rare event of a driver failure (enclosure “loading” is not lost for the
remaining transducer).
Large, Fully Radiused Ports (FRP) ensure smooth air flow through the
ports, especially at higher drive levels. 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 transducers, 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 air pressure, reducing the chance of driving the voice coil out of
the center of the gap at high drive levels.
WARNRNG!:
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’s instructions and a licensed,
professional engineer. Refer all servicing to qualified personnel.
Servicing is required when the apparatus has been damaged in
any way.
WARNRNG!:
Before placing or installing, any speaker
product, inspect all hardware, cabinets, transducers and
associated equipment for damage. Consult a licensed,
professional engineer when any doubt or questions arise
regarding a physical equipment installation.
— Figure 1 —
1079.5 mm
42.5"
841.8 mm
33.14”
419.1 mm
16.5"
9.9 mm
.39"
831.9 mm
32.75"
157 mm
6.2"
205.3 mm
8.1"
