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    Item #: AD-S28Tw-BK

    Description

    Dual 8" bandpass subwoofer, 70/100V transformer with 8Ω bypass, 120Hz bypassable lowpass filter, includes yoke and suspension hardware. Available in black.

    Specifications

    AD-S28Tw

    AcousticDesign™ Surface Mount Subwoofer

    The AcousticDesign Series of installation

    loudspeaker products from QSC expands with the

    new AD-S28Tw surface mount subwoofer system.

    Designed to supplement audio systems by adding

    low-frequency extension, the new AD-S28Tw is

    acoustically matched to the entire AD Series. Rated

    for 250 watts continuous power handling and able

    to take up to 700 watt peaks, the AD-S28Tw is a

    great complement to any of the ceiling-mount or

    surface-mount AD Series models.

    The dual 8" woofers are equipped with

    polypropylene cones for protection in humid

    environments. The bandpass enclosure features

    two chambers. One chamber is completely sealed,

    while the other chamber features a large port. The

    bandpass design allows for tight precise bass with

    extension down to 36 Hz. This highly efficient

    design produces a 1W at 1m sensitivity of 94 dB

    SPL. The AD-S28Tw has a built-in passive low-pass

    filter set at 120 Hz.

    The marine grade plywood enclosure is built to the

    highest standard to provide exceptional resistance

    to high humidity. The zinc-plated steel grille has

    a black foam backing, molded ABS endcaps and

    a rotatable logo. On the rear of the enclosure is

    the input cup with a hinged door to conceal the

    controls and input connections. Input and output

    nickel plated screw terminals accept wiring from

    18 AWG (1.02 mm) to 12 AWG (2.053 mm).

    Two rotary switches can be found in the input

    cup. One switch selects between the 70V/100V

    transformer taps, while the other switch enables or

    disables the internal passive low-pass filter.

    The AD-S28Tw can be deployed in a number

    of ways. With the included rubber feet attached,

    the subwoofer can be floor or shelf-standing.

    Suspended installation is available with either the

    included forged-shoulder eyebolts and accessories

    or the included steel yoke.

    Features

    • Dual 8" polypropylene cone woofers

    • Large port area for extended low-frequency performance

    • Dual chamber ported bandpass cabinet

    • Defeatable passive 120 Hz low-pass filter with

    impedance compensation

    • 250 watts continuous power handling, 700 watts peak

    • 70/100V multitap transformer with 8 ohm bypass

    • Yoke mount and flying hardware included

    • Marine grade plywood construction

    Specifications

    Configuration Surface mount bandpass subwoofer, ported

    Low-frequency Transducer Dual 8" (200 mm) weather resistant, polypropylene cone woofers,

    rubber surround

    Frequency Range1 39

    Frequency Response (-6 dB) 42 Hz – 165 Hz

    Useable Frequency Range (-10 dB) 36 Hz – 205 Hz

    Filter 120 Hz low-pass, passive, bypassable

    Maximum Output2 39

    Calculated Peak/Continuous Output

    2π (half space)

    4π (full space)

    124 dB SPL / 118 dB SPL

    118 dB SPL / 112 dB SPL

    Nominal Impedance 8Ω

    Power Rating 39

    RMS Power Handling3 250 W (2 hours IEC)

    Recommended Max Amp Power 500 W RMS

    Sensitivity 94 dB, 2.83 V, 1 m, half space (2π)

    Transformers 39

    Type Custom low distortion laminated core, wide bandwidth design

    Taps 70V: 200, 100, 50, 25 W / 100V: 200, 100, 15 W /

    8Ω selected by switch

    Environmental Exceeds Mil Spec 810 for humidity, salt spray and dust; IEC 60529

    IP-X4 splash rating

    Enclosure 39

    Material Marine grade plywood, ABS, steel grille

    Finish Textured black paint

    Grille Painted steel

    Connectors 4 position barrier strip; 2 in / 2 out

    Weight - Net/ Shipping 43 lb (19.5 kg)/ 55 lb (25 kg)

    Mounting Hardware (included) Black powder coated steel yoke with attachment hardware

    Black zinc coated forged shoulder steel M6 eyebolts

    Black powder coated steel shear plates with attachment hardware

    Black rubber feet with integral threaded bolt

    1) All frequency ranges specified refer to measured free field response.

    2) Calculated SPL at 1m, speaker operating at rated RMS power with pink noise within specified frequency range

    3) Maximum input power tested in accordance with IEC 268-5 recommendations, 50 Hz – 20 kHz band limiting, 6 dB signal crest factor.

    AD-S28Tw

    1675 MacArthur Boulevard • Costa Mesa, CA 92626 • Ph: 800/854-4079 or 714/957-7100 • Fax: 714/754-6174 qscaudio.com

    AD-S28Tw Spec Sheet - 12/15/08

    Front

    Front

    Front

    Top

    Top

    Top

    Side

    Side

    Specifications subject to change without notice.

    QSC and the QSC logo are registered trademarks of QSC Audio Products, LLC in the U.S. Patent and Trademark office and other countries.

    AcousticDesign is a trademark of QSC Audio Products, LLC. All other trademarks are the property of their respective owners. Patents may apply or be pending.

    please recycle

    AD-S28Tw with Yoke Mount

    Yoke Mount Only

    22.75"

    603 mm

    9.9"

    251 mm

    15.75"

    400 mm

    15.9"

    405 mm

    8"

    203 mm

    1.1"/ 28 mm

    0.5"/ 13 mm

    2.5"/ 64 mm

    5"/ 127 mm

    15.9"

    404 mm

    15.5"

    394 mm

    15.9"

    404 mm

    10"

    245 mm 11.3"

    288 mm

    4.9"

    125 mm

    0.4"

    10 mm

    0.7"

    18 mm

    Dimensions