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QSC Introduces New Surface Mount
Subwoofer
February 10, 2009
Source: QSC Audio Products
Dual eight-inch system is ideally suited
for large or small applications
As the latest addition to QSC's AcousticDesign Series, the
model AD-S28Tw surface mount subwoofer is acoustically matched
to all other offerings within the AD Series. Shipped with
a spec sheet revealing a continuous power handling capacity
of 250 watts and capabilities for managing up to 700 watt
peaks, the new subwoofer has a 70/100 volt multi-tap transformer
with eight ohm bypass, frequency response of 42 Hz-165 Hz,
and sensitivity of 94 dB (1W/1m).

Central to the AD-S28Tw's high performance prowess are a pair
of eight-inch woofers outfitted with polypropylene cones for
added protection in humid environments. The loudspeaker's
bandpass enclosure incorporates a pair of chambers: One that
is completely sealed, and another with a large port. Giving
added precision to low frequency extension down to 36 Hz,
the highly efficient design is further complemented by an
onboard low-pass filter set at 120 Hz.
Featuring marine-grade plywood construction, a zinc-plated
steel grille with a black foam backing, molded ABS endcaps,
and a rotatable logo, the AD-S28Tw enclosure has additionally
been fitted with a recessed rear input panel covered by a
hinged door. Nickel-plated input and output terminals found
on the subwoofer accept wiring ranging from 18 AWG to 12 AWG.
One switch selects between the 70/100V transformer taps, while
another enables or disables the passive low-pass filter.
Adding to the versatility of the AD-S28Tw, attached rubber
feet allow the device to be used on either the floor or a
shelf. Forged-shoulder eyebolts, a steel yoke, and all related
hardware are additionally included with each loudspeaker to
offer options for suspended installation.
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