a large speaker that offers massive sound, but vanishes into your room’s decor. The 90-rt is perfect to be used as stealth mains, rears and side surrounds in a excessive-performance home theater, or for bringing dynamic sound to alternate zones from your primary stereo listening room. Vanishing collection built-in audio system feature our distinctive wafer-thin sheer-grille, a magnetically-secured grille that protrudes handiest 7mm from its surroundings. Sheer-grilles have nearly transparent, extremely-small perfs, and are acoustically inert, for dynamic, unimpeded sound and greater uniform insurance, even in large rooms. These audio system are timbre-matched to polk rti speakers to insure utterly seamless mixing from speaker to speaker in systems that integrate conventional and built-in audio system.