Klipsch RP-500SA II Reference Premiere Surround Sound Speakers, PairTHE MOST VERSATILE SURROUND SPEAKER AVAILABLE The RP 500SA II can be used as an up firing immersive speaker for Dolby Atmos Technology, a height speaker or a rear surround model all with the flip of a switch. Immersive sound comes alive from all directions, including overhead, with these Dolby Atmos enabled speakers. Add to any monitor or tower speaker or use as surround speakers for a hemisphere of rich, detailed sound. 90 X 90 SILICON COMPOSITE