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AcousticDesign™ Series
AD-C820/C821


High-output Ceiling Mount Loudspeakers


AD-C820/C821

Available Summer 2010

The AD-C820 and AD-C821 are acoustically identical and designed for music playback, public address and distributed audio in applications that require high output from a ceiling mounted loudspeaker. The AcousticDesign™ Series of installation loudspeakers has been designed for trouble free operation and versatility. Both models use custom designed transducers and crossover networks, in combination with an acoustically optimized enclosure (AD-C800BB), or as a fully integrated, sealed system (AD-C821). These loudspeakers continue the AD Series philosophy of bringing natural and accurate sound quality combined with versatility and reliability to high-ceiling applications.

Each AD-C820 includes the coaxial transducers, a transformer and a crossover network factory mounted on a steel baffle. The baffle is designed to mount to the QSC enclosure (AD-C800BB).

The AD-C821 is a fully integrated, factory sealed system using a "dog-ear" style mounting scheme. To better blend with the facility architecture, either speaker may be installed with your choice of a round (AD-C800RG) or square (AD-C800SG) grille (offered separately).

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. The system achieves 90 degree axisymmetric coverage.

High-current, low tolerance network components provide smooth full-range, passive performance. The included 70V/100V, custom designed transformer is optimized for low line loss as well as accurate and transparent acoustic performance.

The AD-C820/C821 loudspeakers measure 91dB sensitivity (1W/1m) and at full continuous power is capable of producing 114 dB SPL (1W/1m) output.

FEATURES
  • 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-C820 transducer/baffle assembly for separated backcan installation
  • AD-C821 designed as a fully integrated blind-mount system

 

ACOUSTICDESIGN SERIES


DOCUMENTS

AD-C820/C821 Specifications (PDF 325K)

HI-RES IMAGES

AD-C820
AD-C821
AD-C820 with round grille
AD-C820 with square grille


AD-C820 with round grille (AD-C800RG)
AD-C820 with round grille (AD-C800RG)

AD-C820 with square grille (AD-C800SG)AD-C820 with square grille (AD-C800SG)

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Preliminary Specifications


SPECIFICATIONS
 AD-C820 AD-C821
Configuration Passive
Low-frequency Transducer 8" (203 mm) ferrite woofer
Hight-frequency Transducer 1.4" (36 mm) neodymium compression driver
Frequency Range 1
  Frequency Response (-6 dB)
  Useable Frequency Range (-10 dB)
61 Hz - 18 kHz
52 Hz- 18 kHz
Maximum Output 2
  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 Handling3
  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
Enclosure Volume AD-C800BB: 18 L (0.64 ft 3) 18 L (0.64 ft 3)
Connectors Back box (AD-C800BB): ceramic block connector inputs and “through” connectors (rated for 400 W max). Loudspeaker Baffle (AD-C820): 10-pin MATE-N-LOK™ connector and faston connectors. Two 2-pin Euro-style connectors
Mounting Hardware Pre-installed, suspended, back box, four vertical mounting straps.
Loudspeaker Baffle: captive, integral Mounting Clamps.		 Captive, integral Mounting Clamps. Insert enclosure into mounting hole, and tighten. Suspended ceiling Split-ring and Suspended Ceiling Tile Rails - sold separately.
Weight - Net AD-C820: 8 lb (3.6 kg)
AD-C800BB: 9.5 lb (4.3 kg)
System Weight: 17.5 lb (7.9 kg)		 15 lb (6.8 kg)
Dimensions Diameter: 14.9" (379 mm)
Enclosure only Depth: 8.3" (211 mm)
Enclosure with mounting straps Depth: 11.2" (284 mm)		 Diameter: 13.4" (340 mm)
Depth: 11.9" (302 mm)
Available Accessories AD-C800RG, AD-C800SG grilles
1 All frequency ranges specified refer to measured half-space response (2 pi).
2 Calculated maximum peak SPL at 1 m, half-space, speaker operating at rated rms power pink noise input, 50 Hz – 20 kHz.
3 Maximum input power tested in accordance with IEC recommendations; 50 Hz – 20 kHz band limiting, 6 dB signal crest factor.

Specifications subject to change without notice.


AcousticDesign Ceiling Mount Loudspeakers

Click Here to see all the AcousticDesign models
AD-C81Tw AD-CI52ST AD-CI52T AD-C42T
AD-C81Tw AD-CI52ST AD-CI52T AD-C42T
AD-C820/C821 AD-C1200  
AD-C820/C821 AD-C1200  

QSC and the QSC logo are registered trademarks of QSC Audio Products LLC in the U.S. Patent and Trademark office and other countries.
AcousticDesign is a trademark of QSC Audio Products, LLC. MATE-N-LOK is a trademark of Tyco. All other trademarks are the property of their respective owners.

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QSC and the QSC logo are registered trademarks of QSC Audio Products, LLC in the U.S. Patent and Trademark office and other countries. All other trademarks are the property of their respective owners. Patents may apply or be pending.