In-Ceiling Speakers System

System Package Includes: AD-C820, AD-C800BB back box assembly and AD-C800RG round grille.

The AD-C820 is 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. This model uses custom designed transducers and crossover networks, in combination with an acoustically optimized enclosure (AD-C800BB). 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 8 inch 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 inch 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 loudspeakers measure 91dB sensitivity (1W/1m) and at full continuous power are capable of producing 114 dB SPL (1W/1m) output.

Key Features

  • 8 inch low-frequency woofer
  • 1.4 inch 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

Technical Specifications

Low-Frequency Transducer
8 inch (203 mm) ferrite woofer
High-Frequency Transducer
1.4 inch (36 mm) neodymium compression driver
Frequency Range
Frequency Response (-6 dB): 61 Hz to 18 kHz
Useable Frequency Range (-10 dB): 52 Hz to 18 kHz
Maximum Output
Calculated Peak Output: 120 dB SPL
Calculated Continuous Output: 114 dB SPL
Nominal Coverage
90 deg horizontal and vertical
Nominal Impedance
16 ohms
Power Rating
Continuous power handling
Recommended Amplifier Power (loudspeaker program power)
200 W
400 W
91 dB SPL, 1W/1m
Bass Loading
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 Volume
AD-C800BB: 18 liter (0.64 ft3)
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
Mounting Hardware
Pre-installed, suspended, back box, four vertical mounting straps.
Loudspeaker Baffle: captive, integral Mounting Clamps.
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)
Diameter: 14.9 inch (379 mm)
Enclosure only Depth: 8.3 inch (211 mm)
Enclosure with mounting straps Depth: 11.2 inch (284 mm)


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