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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.
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
Specifications AD-C820 AD-C821
Configuration Passive
Transducers
Low-frequency
High-frequency
8" (203 mm) ferrite woofer
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 16Ω
Power Rating
RMS Power Handling
3
Recommended Max Amp Power
200 W
400 W
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
70 V: 16Ω 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 AD-C800BB: 18 L (0.64 ft
3
) 18 L (0.64 ft
3
)
Enclosure
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 verti-
cal 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)
System Packages AD-C820R SYSTEM: includes
AD-C820 speaker baffle, AD-C800BB back-
box, AD-C800RG round grille
AD-C820S SYSTEM: includes
AD-C820 speaker baffle, AD-C800BB back-
box, AD-C800SG square grille
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
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.