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The QSC AcousticDesign AD-C81Tw will bolster your system's low end with an 8-inch polypropylene cone woofer, 200 watts power handling, and a maximum SPL of 118dB. This install subwoofer features a robust ported design for extended low-frequency performance. You also get a 70V/100V multitap transformer with 8-ohm bypass. The AD-C81Tw boasts a weather-resistant driver, with an injection-molded, high-impact polystyrene baffle on a steel enclosure, plus a hardy aluminum grille. What's more, a fire-protective sub-chamber safeguards the sub's input panel. We appreciate that QSC includes a C-ring and tile rails with the AD-C81Tw, along with a paint mask. A defeat-able passive 120Hz lowpass filter, complete with impedance compensation, rounds out the AcousticDesign AD-C81Tw's impressive features.

More Information


  • 8-inch polypropylene cone woofer
  • Large port area for extended low-frequency performance
  • Defeatable passive 120 Hz low-pass filter with impedance compensation
  • 100 watts continuous power handling, 400 watts peak
  • 70/100 V multitap transformer with 8 ohm bypass
  • C-ring and tile rails included
  • Side cable entry

Package Includes:

  • AD-C81Tw loudspeaker
  • C-ring and tile rails
  • Round grille (white, paintable)
  • Paint mask
  • Connector assembly

Technical Specification

Tech Specs

  • Power Configuration:Subwoofer
  • LF Driver Size:8" weather resistant, polypropylene cone woofer
  • Power Rating:200W
  • Impedance:8 ohms
  • Inputs:1 x Euroblock
  • Frequency Range:28Hz-208Hz
  • Maximum Peak SPL:118dB SPL
  • Enclosure Material:Steel with aluminum grille
  • Mounting Options:In-Ceiling
  • Width:12.6"
  • Depth:14.5"
  • Weight:20 lbs.
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