The AD-C1200 is complemented by the AD-C820/C821, which features 8-inch low frequency woofer, 1.75-inch diaphragm compression driver, 200-watt continuous power rating, 70-volt/100-volt multi-tap transformer (enabling the system to operate in distributed or low-impedance mode) and AD-C820 transducer/baffle assembly for separated backcan installation. 

The AD-C821 has been 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. 

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). 

Each AD-C820 includes the coaxial transducers, a transformer and a crossover network, factory mounted on a steel baffle.  The baffle is designed to mount to the QSC enclosure.

The AD-C821 is a fully integrated, factory sealed system using a ‘dog ear’-style mounting scheme. 

An optional round (AD-C800RG) or square (AD-C800SG) grille is available to complete the installation.

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 52Hz. The 1.75-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 105-degree axisymmetric coverage.

High-current, low tolerance network components provide smooth full-range, passive performance. The included 70-volt/100-voplt custom designed transformer is optimized for low line loss as well as accurate and transparent acoustic performance.

The AD-C820 loudspeaker system measures 91 dB sensitivity (1W/1m) and at full continuous power is capable of producing 114 dB SPL (1W/1m) output.

QSC Audio Website

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