Sold as a pair
These had been floor models
The specifications come from the Klipsch website:

This high-value, easy-to-install ceiling speaker delivers very good sound at modest cost. It is an excellent choice for distributed music systems and other applications requiring unobtrusive, high-quality loud speakers. (CS-800-Rs can work well as surround speakers in home theater systems, for example.) Built around an 8-inch woofer, the CS-800-R produces bass with a solidity and depth not normally associated with in ceiling designs, and it blends well both sonically and cosmetically with the smaller CS-650-R in situations that demand a combination of larger and smaller speakers, as well as with Contractor Series in-walls.

 SPECIFICATIONS 
 BANDWIDTH 43Hz-20kHz ± 3dB 
 SENSITIVITY 90dB @ 2.83 volts/1 meter 
 NOMINAL IMPEDANCE 8 ohms compatible 
 CROSSOVER FREQUENCY 3800Hz 
 POWER HANDLING 40 watts (160 watts peak)

 WIRE GAUGE ACCOMMODATED 12 
 WEIGHT 4 lbs. (1.8kg) 
 DIAMETER 11.1" (28.2cm) 
 MOUNTING DEPTH 4.8" (12.2cm) 
 CUTOUT DIMENSIONS 9.8" (24.9cm) 
 FINISH White