QSC AD-S6T-WH Series 6.5

QSC AD-S6T-WH Series 6.5" 2-Way 150W Surface-Mount Loudspeaker (White)

QSC AD-C820R System High-Output Ceiling Mount Loudspeaker (Round Grille)


The QSC AD-C820R System includes an AD-C820 speaker baffle, AD-C800BB backcan assembly and AD-C800RG round grille.

The AD-C820 ceiling speaker is designed for music playback, public address and distributed audio in applications that require high output from a ceiling mounted loudspeaker. It uses custom designed transducers and crossover networks, in combination with an acoustically optimized enclosure (AD-C800BB). The 8" woofer is equipped with a treated paper cone on a steel frame. In the optimized enclosure the usable low frequency of the system extends to 52 Hz. The 1.4" compression driver fires through the center of the woofer and is acoustically mated to the woofer for a smooth transition at crossover. High-current, low tolerance network components provide smooth full-range, passive performance. The included 70/100 V, custom designed transformer is optimized for low line loss as well as accurate and transparent acoustic performance.


  • AD-C820 speaker baffle
  • AD-C800BB backcan assembly
  • AD-C800RG round grille (white, paintable)


  • 8" low-frequency woofer
  • 1.4" diaphragm compression driver
  • 200W continuous power rating
  • 70/100 V multi-tap transformer included (system can operate in distributed or low-impedance mode)
  • AD-C820 transducer/baffle assembly for separated backcan installation


  • LF Transducer: 8" (203 mm) ferrite woofer
  • HF Transducer: 1.4" (36 mm) neodymium compression driver
  • Frequency Response (-6 dB): 61 Hz - 18 kHz
  • Useable Frequency Range (-10 dB): 52 Hz- 18 kHz
  • Maximum Output Calculated Peak: 120 dB SPL
  • Output Calculated Continuous Output: 114 dB SPL
  • Nominal Coverage: 90° horizontal and vertical
  • Nominal Impedance: 16 O
  • Power Rating
    • RMS Power Handling: 200W
    • Recommended Max Amp Power: 400W
  • Sensitivity: 91 dB SPL, 1W / 1 m
  • Bass Loading: Ported
  • Transformer Type: Custom low distortion laminated core, wide bandwidth design
  • Transformer Taps:
    • 100 V: 16 O bypass, 100W, 50W, 25W
    • 70 V: 16 O bypass, 100W, 50W, 25W, 12.5W
  • Agency Rating: CE, UL 1480 (commercial/professional use) UL 2043 (air handling spaces)
  • Enclosure Volume (AD-C800BB): 18 L (0.64 ft³)
  • Connectors:
    • Back box: Ceramic block connector inputs and "through" connectors (rated for 400W max)
    • Baffle: 10-pin MATE-N-LOK™ connector and faston connectors
  • Mounting Hardware:
    • Back box: 4 vertical mounting straps
    • Baffle: Captive, integral mounting clamps
  • Net Weight:
    • AD-C820: 8 lbs. (3.6 kg)
    • AD-C800BB: 9.5 lbs. (4.3 kg)
    • System: 17.5 lbs. (7.9 kg)
  • Dimensions:
    • Diameter: 14.9" (379 mm)
    • Depth (enclosure only): 8.3" (211 mm)
    • Depth (enclosure with mounting straps): 11.2" (284 mm)
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