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MSRP: $582.00

QSC AcousticDesign AD-C821R Ceiling Speaker System (with Hardware and Round Grille)


The AD-821 is a fully integrated, factory sealed system using a "dog-ear" style mounting scheme. When ordered as a system (AD-C821R SYSTEM; AD-C821S SYSTEM) a set of tile rails and a split ring are included as is a round or square grille.

1 qty. AD-C821 blind-mount loudspeaker system 
1 qty. Split ring and tile rails
1 qty. AD-C800RG Round grille (white, paintable)

The AcousticDesign™ Series of installation loudspeakers has been designed for trouble free operation and versatility. They use custom designed transducers and crossover networks, in combination with an acoustically optimized enclosure (AD-C800BB). These loudspeakers continue the AD Series philosophy of bringing natural and accurate sound quality combined with versatility and reliability to high-ceiling applications.


  • 8" low-frequency woofer
  • 1.4" diaphragm compression driver
  • 200 watt continuous power rating
  • 70V/100V multi-tap transformer included (system can operate in distributed or low-impedance mode)
  • AD-C821 designed as a fully integrated blind-mount system


Configuration Passive
Low-frequency Transducer 8" (203 mm) ferrite woofer
High-frequency Transducer 1.4" (36 mm) neodymium compression driver
Frequency Range
Frequency Response (-6 dB)
Useable Frequency Range (-10 dB)
61 Hz - 18 kHz
52 Hz- 18 kHz
Maximum Output
Calculated Peak Output
Calculated Continuous Output
120 dB SPL
114 dB SPL
Nominal Coverage 90° horizontal and vertical
Nominal Impedance 16 ohms
Power Rating
RMS Power Handling
Recommended Max Amp Power
200 W
400 W
Sensitivity 91 dB SPL, 1W/1m
Bass Loading Ported
Transformer Type Custom low distortion laminated core, wide bandwidth design
Transformer Taps 100 V: 16 ohms bypass, 100 W, 50 W, 25 W
70 V: 16 ohms bypass, 100 W, 50 W, 25 W, 12.5 W
Agency Rating CE, UL 1480 (commercial/professional use) UL 2043 (air handling spaces)
Enclosure Volume 18 L (0.64 ft 3)
Connectors Two 2-pin Euro-style connectors
Mounting Hardware Captive, integral Mounting Clamps. Insert enclosure into mounting hole, and tighten. Suspended ceiling Split-ring and Suspended Ceiling Tile Rails - sold separately.
Weight - Net 16 lb (7.3 kg)
Dimensions Diameter: 13.4" (340 mm)
Depth: 11.9" (302 mm)


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