QSC AD-S28Tw Dual 8" 70V Surface Mount Subwoofer

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  • Dual 8-inch 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

Package Includes:
AD-S28Tw loudspeaker
Yoke mount
Suspension hardware kit
Grille backing cloth

ConfigurationSurface mount bandpass subwoofer, ported
Low-frequency transducerDual 8-inch (200 mm) weather resistant, polypropylene cone woofers, rubber surround
Frequency range 1
Frequency response (-6 dB)
Useable frequency range (-10 dB)

42 to 165 Hz
36 to 205 Hz
Filter120 Hz low-pass, passive, bypassable
Maximum output 2
Calculated peak / continuous Output
2 pi (half space)
4 pi (full space)

124 dB SPL / 118 dB SPL
118 dB SPL / 112 dB SPL
Nominal impedance8 ohms
Power rating
Continuous power handling3
Recommended max amp power

250 W (2 hours IEC)
500 W (loudspeaker "program" power)
Sensitivity94 dB, 2.83 V at 1 m, half space (2 pi)
TypeCustom low distortion laminated core, wide bandwidth design
Taps70V: 200, 100, 50, 25 W; 8Ω bypass
100V: 200, 100, 50 W; 8Ω bypass
MaterialMarine grade plywood, ABS, steel grille
EnvironmentalExceeds Mil Spec 810 for humidity, salt spray and dust; IEC 60529 IP-X4 splash rating
FinishTextured black paint
GrillePainted steel
ConnectorsFour-position barrier strip; 2 in / 2 out
Mounting HardwareBlack 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
Net Weight43 lb / 19.5 kg
Shipping Weight55 lb / 25 kg


More Information
MPN (manufacturer part number)AD-S28Tw
UPC (Universal Product Code)00684284053992
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