Products / Loudspeakers / AcousticDesign / Ceiling Mount

AcousticDesign™ Series
AD-C820/C821

High-output Ceiling Mount Loudspeakers

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.

The AD-C820 assembly includes the coentrant transducers, a 70V/100V transformer and a crossover mounted on an ABS baffle. When ordered as a system (AD-C820R SYSTEM; AD-C820S SYSTEM) the backbox (AD-C800BB) and a round or square grille are included.

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.

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 are 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

AD-C820 and AD-C821 are sold in the following system packages:

AD-C820R SYSTEM
1 qty. AD-C820 speaker baffle
1 qty. AD-C800BB Backcan assembly
1 qty. AD-C800RG Round grille (white, paintable)

AD-C820S SYSTEM
1 qty. AD-C820 speaker baffle
1 qty. AD-C800BB Backcan assembly
1 qty. AD-C800SG Square grille (white, paintable)

AD-C821R SYSTEM
1 qty. AD-C821 blind-mount loudspeaker system
1 qty. Split ring and tile rails
1 qty. AD-C800RG Round grille (white, paintable)

AD-C821S SYSTEM
1 qty. AD-C821 blind-mount loudspeaker system
1 qty. Split ring and tile rails
1 qty. AD-C800SG Square grille (white, paintable)

AD-C820/821 Additional mounting accessories:
ADC-MRS Existing construction bracket for drywall or other solid materials
ADC-NCS New construction bracket for drywall or other solid materials

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)	16 lb (7.3 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)

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-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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