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

8" (203 mm) ferrite woofer

 

High-frequency

1.4" (36 mm) neodymium compression driver

 

Frequency Range1

 

 

Frequency Response (-6 dB)

61 Hz – 18 kHz

 

Useable Frequency Range (-10 dB)

52 Hz – 18 kHz

 

Maximum Output 2

 

 

Calculated Peak Output

120 dB SPL

 

Calculated Continuous Output

114 dB SPL

 

Nominal Coverage

90° horizontal and vertical

 

 

 

 

Nominal Impedance

16Ω

 

Power Rating

 

 

RMS Power Handling3

200 W

 

Recommended Max Amp Power

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

Two 2-pin Euro-style connectors

 

connector inputs and “through” connectors

 

 

(rated for 400 W max). Loudspeaker Baffle

 

 

(AD-C820): 10-pin MATE-N-LOK™ connector

 

 

and faston connectors.

 

Mounting Hardware

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

Captive, integral Mounting Clamps.

 

cal mounting straps.

Insert enclosure into mounting hole,

 

Loudspeaker Baffle: captive, integral

and tighten. Suspended ceiling Split-ring

 

Mounting Clamps.

and Suspended Ceiling Tile Rails - sold

 

 

separately.

Weight - Net 

AD-C820: 8 lb (3.6 kg)

16 lb (7.3 kg)

 

AD-C800BB: 9.5 lb (4.3 kg)

 

 

System Weight: 17.5 lb (7.9 kg)

 

 

 

 

Dimensions

Diameter: 14.9" (379 mm)

Diameter: 13.4" (340 mm)

 

Enclosure only Depth: 8.3" (211 mm)

Depth: 11.9" (302 mm)

 

Enclosure with mounting straps

 

 

Depth: 11.2" (284 mm)

 

System Packages

AD-C820R SYSTEM: includes

AD-C821R SYSTEM: includes

 

AD-C820 speaker baffle, AD-C800BB back-

AD-C821 loudspeaker system,

 

box, AD-C800RG round grille

AD-C800RG round grille, and set of tile

 

AD-C820S SYSTEM: includes

rails and c-ring

 

AD-C820 speaker baffle, AD-C800BB back-

AD-C821S SYSTEM: includes

 

box, AD-C800SG square grille

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.

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QSC Audio specifications Features, Specifications, AD-C820 AD-C821

AD-C821, AD-C820 specifications

QSC Audio has established itself as a leader in professional audio solutions, and the AD-C820, AD-C821, and AD-C1200 speakers are prime examples of the company's innovative engineering and commitment to quality. These models are designed specifically for high-performance commercial sound applications, such as restaurants, retail spaces, and corporate environments.

The AD-C820 and AD-C821 are part of QSC's AcousticDesign Series, featuring a compact, sleek design that blends seamlessly into any architectural environment. Both models utilize QSC's proprietary Directivity Matched Waveguide technology. This ensures consistent coverage across the listening area, reducing the possibility of dead spots and enhancing audio clarity. The AD-C820 is an 8-inch two-way speaker, while the AD-C821 is a more powerful 8-inch loudspeaker that includes a coaxial design, offering an exceptional audio experience with a wider frequency response and improved tonal balance.

Both speakers are equipped with a unique DMT (Directivity Matched Transition) system, which provides seamless transition between high and low frequencies, significantly improving sound quality during a range of applications. Furthermore, the AD-C821 features a dedicated high-frequency driver that allows for extended high-frequency performance, making it suitable for environments that require more detailed sound reproduction.

On the other hand, the AD-C1200 is a powerful 12-inch ceiling loudspeaker that is perfect for larger spaces. It incorporates a high-output woofer, providing warm and rich bass response. With QSC's specially designed high-frequency driver, the AD-C1200 delivers a clear and detailed audio experience, ensuring that voices and instruments are rendered with precision.

All three models feature an innovative Waveguide design that enhances coverage patterns, ensuring a uniform sound experience regardless of the listener's location. Additionally, these loudspeakers come with a robust enclosure that minimizes ambient noise interference, further enhancing audio fidelity. The integration of rugged components ensures long-lasting performance under various conditions, making them ideal for diverse commercial applications.

In summary, the QSC Audio AD-C820, AD-C821, and AD-C1200 speakers offer a blend of advanced technology, exceptional sound quality, and practical design. Their versatility makes them an excellent choice for anyone looking to achieve high-quality audio in commercial environments, making QSC a trusted name in the professional audio industry.