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QSC AD-S28Tw Surface Mount Subwoofer
QSC AD-S28Tw Surface Mount Subwoofer

QSC AD-S28Tw Surface Mount Subwoofer

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SoundPro Item: 46615
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Supplement your sound system and extend your low-frequency with the AD-S28Tw Surface Mount Subwoofer from QSC’s AcousticDesign Series. Built for maximum compatibility with the AD Series ceiling- and surface-mount speakers, this sub is rated for 250W continuous power handling and is capable of up to 700W peaks.

The AD-S28Tw’s bandpass enclosure features two chambers: one of which is completely sealed, while the other chamber features a large port. This bandpass allows for tight precise bass with extension down to 36 Hz, producing a 1W at 1m sensitivity of 94 dB SPL. The sub also boasts a built-in passive low-pass filter set at 120 Hz.

Made to handle the most humid environments, the AD-S28Tw’s dual 8" woofers are equipped with polypropylene cones, and enclosed in marine-grade plywood. The sub’s grille is zinc-plated steel with black foam backing to protect the interior components and is surrounded by ABS endcaps and finished with a rotatable logo.

The rear of the AD-S28Tw houses an input cup with a hinged door to conceal the controls and connections. Inside this door, input and output nickel-plated screw terminals accept wiring from 18 AWG (1.02 mm) to 12 AWG (2.053 mm). Also found in the input cup are two rotary switches: one that selects between the 70V/100V transformer taps, and the other which enables or disables the internal passive low-pass filter.

The AD-S28Tw’s attached rubber feet are for standing the sub on a floor or shelf, while forged-shoulder eyebolts and a steel yoke are also included for suspension mounting.

More about QSC’s AcousticDesign Series

Easy installation, flexible mounting options, and rugged, high-weather resistance are just three of the features that set QSC’s AcousticDesign™ series apart. These premium loudspeakers are designed to give contractors and integrators versatile, reliable solutions for permanent sound installations. Unified by premium audio quality and consistent tonal characteristics this series is comprised of ceiling, surface, and pendant alternatives ideal for environments where you need the perfect combination of performance, coverage, and aesthetic appeal.

QSC AD-S28Tw 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
  • 70/100V multitap transformer with 8 ohm bypass
  • Yoke mount and flying hardware included
  • Marine grade plywood construction
  • AD-S28Tw Surface Mount Subwoofer1
  • 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): 42 to 165 Hz
    • Useable frequency range (-10 dB): 36 to 205 Hz
  • Filter120 Hz low-pass, passive, bypassable
  • Maximum output 2
    • 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 impedance8 ohms
  • Power rating
    • Continuous power handling3
    • Recommended max amp power
      • 250W (2 hours IEC)
      • 500W (loudspeaker "program" power)
    • Sensitivity: 94 dB, 2.83V 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
  • Enclosure
    • 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 lbs (19.5 kg)
    • Shipping Weight: 55 lbs (25 kg)
  • Notes
    • 1 All frequency ranges specified refer to measured free field response.
    • 2 Calculated SPL at 1 m, 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.

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QSC AD-S28Tw Surface Mount Subwoofer

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