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QSC AD-S28Tw Dual 8in Subwoofer - Black

Model: QSC AD-S28TW-B

QSC AD-S28Tw Dual 8in Subwoofer - Black
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About: QSC AD-S28Tw Dual 8in Subwoofer - Black

QSC AcousticDesign™ surface loudspeakers offer a variety of models specifically tailored for demands of higher fidelity applications.  Designed for clarity and presence, these loudspeaker systems deliver pristine audio reproduction for installations requiring a refined audio experience.  Models ship complete with the award winning X-Mount™ system and weather input cover.


  • 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

Package Includes:

  • AD-S28Tw loudspeaker
  • Yoke mount
  • Suspension hardware kit
  • Grille backing cloth


  • Configuration: Surface mount bandpass subwoofer, ported
  • Low-frequency transducer: Dual 8" (200 mm) weather resistant, polypropylene cone woofers, rubber surround
  • Frequency range
    • Frequency response (-6 dB): 42 to 165 Hz
    • Useable frequency range (-10 dB): 36 to 205 Hz
  • Filter 120 Hz low-pass, passive, bypassable
  • Maximum output: Calculated peak / continuous Output
    • 2 pi (half space): 124 dB SPL / 118 dB SPL
    • 4 pi (full space): 118 dB SPL / 112 dB SPL
  • Nominal impedance: 8 ohms
  • Continuous power handling: 250 W (2 hours IEC)
  • Recommended max amp power: 500 W (loudspeaker "program" power)
  • Sensitivity: 94 dB, 2.83 V at 1 m, half space (2 pi)
  • Transformers:
    • Type Custom low distortion laminated core, wide bandwidth design
    • Taps 70V: 200, 100, 50, 25 W; 8Ω bypass
    • 100V: 200, 100, 50 W; 8Ω bypass


  • Material: Marine grade plywood, ABS, steel grille
  • Environmental: Exceeds Mil Spec 810 for humidity, salt spray and dust; IEC 60529 IP-X4 splash rating
  • Finish: Textured black paint
  • Grille: Painted steel
  • Connectors: Four-position barrier strip; 2 in / 2 out
  • Mounting Hardware:
    • 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
  • Net Weight 43 lb / 19.5 kg
  • Shipping Weight 55 lb / 25 kg

UPC: 684284053992 is a Canadian authorized QSC retailer.

Reviews: QSC AD-S28Tw Dual 8in Subwoofer - Black

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Warranty: QSC AD-S28Tw Dual 8in Subwoofer - Black Warranty:

30 Days

Manufacturer's Warranty:

  • Amplifiers and Speakers: 3-year limited
  • Mixers and CP Series speakers: 1-year limited
  • RMXa, CMXa, PLX2, GX, GXD, K, KW, K.2 and KS: 3-year limited + additional 3 years of warranty upon registration on the QSC website for a total of 6 years limited warranty**
  • TouchMix-8, TouchMix-16, TouchMix-30 Pro: 1-year limited + additional 2 years of warranty upon registration on the QSC website for a total of 3 years limited warranty**
  • CP8 and CP12: 1-year limited + additional 5 years of warranty upon registration on the QSC website for a total of 6 years limited warranty**
  • Accessories: 90 days limited

**Registration on QSC website must be completed within 30 days of purchase**