QSC AD-C820R, AD-C821R User Manual

AD-C820/C821

AcousticDesign™ High-output Ceiling Mount Loudspeakers

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

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 c-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.

Specifications AD-C820 AD-C821

Configuration Passive

Transducers
Low-frequency
High-frequency

Frequency Range
Frequency Response (-6 dB)
Useable Frequency Range (-10 dB)

Maximum Output
Calculated Peak Output
Calculated Continuous Output

Nominal Coverage 90° horizontal and vertical

Nominal Impedance 16Ω

Power Rating
RMS Power Handling
Recommended Max Amp Power

Sensitivity 91 dB SPL, 1W/1m

Bass Loading Ported

Transformers

Type Custom low distortion laminated core, wide bandwidth design

Taps 100 V: 16Ω bypass, 100 W, 50 W, 25 W

Agency Rating CE, UL 1480 (commercial/professional use) UL 2043 (air handling spaces)

Enclosure Volume AD-C800BB: 18 L (0.64 ft 3) 18 L (0.64 ft 3)

Enclosure

Connectors Back box (AD-C800BB): ceramic block

Mounting Hardware Pre-installed, suspended, back box, four verti-

Weight - Net AD-C820: 8 lb (3.6 kg)

Dimensions Diameter: 14.9" (379 mm)

System Packages AD-C820R SYSTEM: includes

1) All frequency ranges specified refer to measured half-space response (2 pi).

2) Calculated maximum peak SP L 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.

1

2

3

8" (203 mm) ferrite woofer

1.4" (36 mm) neodymium compression driver

61 Hz – 18 kHz
52 Hz – 18 kHz

120 dB SPL
114 dB SPL

200 W
400 W

70 V: 16Ω bypass, 100 W, 50 W, 25 W, 12.5 W

connector inputs and “through” connectors
(rated for 400 W max). Loudspeaker Baffle
(AD-C820): 10-pin MATE-N-LOK™ connector
and faston connectors.

cal mounting straps.
Loudspeaker Baffle: captive, integral
Mounting Clamps.

AD-C800BB: 9.5 lb (4.3 kg)
System Weight: 17.5 lb (7.9 kg)

Enclosure only Depth: 8.3" (211 mm)
Enclosure with mounting straps
Depth: 11.2" (284 mm)

AD-C820 speaker baffle, AD-C800BB back­box, AD-C800RG round grille
AD-C820S SYSTEM: includes
AD-C820 speaker baffle, AD-C800BB back­box, AD-C800SG square grille

Two 2-pin Euro-style connectors

Captive, integral Mounting Clamps.
Insert enclosure into mounting hole,
and tighten. Suspended ceiling Split-ring
and Suspended Ceiling Tile Rails - sold
separately.

16 lb (7.3 kg)

Diameter: 13.4" (340 mm)
Depth: 11.9" (302 mm)

AD-C821R SYSTEM: includes
AD-C821 loudspeaker system,
AD-C800RG round grille, and set of tile
rails and c-ring
AD-C821S SYSTEM: includes
AD-C821 loudspeaker system,
AD-C800SG square grille, and set of tile
rails and c-ring

AD-C820/C821 Dimensions

AD-C820/AD-C821

Front

8.2"

208 mm

13.38"

340 mm

AD-C820

6.6"

168 mm

AD-C800BB

11.9"

302 mm

10.9"

277 mm

Side

0.36"

9 mm

11.5"

292 mm

13.4"

340 mm

Side

8"

203 mm

0.3"

8 mm

AD-C821

11.9"

302 mm

11.6"

295 mm

Side

11.5"

292 mm

13.4"

340 mm

0.3"

8 mm

AD-C800RG

AD-C800SG

11.8"

299 mm

14"

356 mm

14.9"

378 mm

Side

0.5"

12 mm

14"

356 mm

Side

0.5"

12 mm

14"

356 mm

Specifications subject to change without notice.

©2010 QSC Audio Products, LLC. All rights reserved. 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.
Patents may apply or be pending.

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AD-C820/C821 Spec Sheet - 09/01/10

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