Specifications

58
LOUDSPEAKERS
AcousticDesign™ Subwoofer
Installed Sound
AD-S28Tw
The AD-S28Tw is acoustically matched to the entire
AD Series and is designed to supplement audio
systems by adding low-frequency extension. 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
2
) to
12 AWG (2.053 mm
2
). Two rotary switches can be
found in the input cup. One switch selects between the
70/100 volt 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.
NEW!
AD-S28Tw
System Type Surface mount bandpass subwoofer, ported
Low-frequency Transducer
Dual 8" (200 mm) weather resistant, polypropylene
cone woofers, rubber surround
Frequency Range
1
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 Output
2
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 Handling
3
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
70 V: 200, 100, 50, 25 W / 100 V: 200, 100, 50 W /
8Ω selected by switch
Environmental
Exceeds Mil Spec 810 for humidity, salt spray and
dust; IEC 60529 IP-X4 splash rating
Connectors 4 position barrier strip; 2 in / 2 out
Dimensions (HWD) inches 15.9" x 9.9" x 22.75"
Dimensions (HWD) mm 404 mm x 251 mm x 603 mm
Weight 43 lb / 19.5 kg
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.
RoHS