Polk Audio is expanding its Sigma Series lineup of sounders with the Sigma S3, a $249 option to upgrade your home theater. This model offers four performance-tuned drivers and a wireless subwoofer that gives you a fantastic theater experience right inside of your home. You can pass through the latest HD, 4K, and 8K signals and it can even decode Dolby Digital 5.1 content that provides a lifelike home theater sound through a single HDMI ARC connection. Plus, you’ll find Chromecast for Audio built-in here that makes it super simple to enjoy your favorite tunes without turning on your TV.