QSC ADS-28-TW Brochure

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

• 70/100 V multitap transformer with 8 ohm bypass

• Yoke mount and flying hardware included

• Marine grade plywood construction

AD-S28T w

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.

Specifications

Configuration Surface mount bandpass subwoofer, ported

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

Frequency Range

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 Output

Calculated Peak / Continuous Output
2π (half space)
4π (full space)

Nominal Impedance 8Ω

Power Rating 39

RMS Power Handling

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 /

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

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

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.

1

2

3

rubber surround

39

39

124 dB SPL / 118 dB SPL
118 dB SPL / 112 dB SPL

250 W (2 hours IEC)

8Ω selected by switch

IP-X4 splash rating

Black zinc coated forged shoulder steel M6 eyebolts
Black powder coated steel shear plates with attachment hardware
Black rubber feet with integral threaded bolt

AD-S28T w

22.75"

603 mm

15.9"

404 mm

Dimensions

15.5"

394 mm

9.9"

251 mm

Top

AD-S28Tw with Yoke Mount

15.9"

404 mm

Front

Front

10"

245 mm

4.9"

125 mm

Side

288 mm

0.4"

10 mm

11.3"

Top

Yoke Mount Only

0.7"

18 mm

15.75"

400 mm

Top

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.

8"

203 mm

Side

1675 MacArthur Boulevard • Costa Mesa, CA 92626 • Ph: 800/854-4079 or 714/957-7100 • Fax: [phone]

AD-S28Tw Spec Sheet - 12/15/08

1.1" / 28 mm

0.5" / 13 mm

2.5" / 64 mm

5" / 127 mm

15.9"

405 mm

Front

please recycle

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