Polk Audio Signa S4D Powered 3.1.2-Ch Dolby Atmos Sound Bar and Wireless Subwoofer System with Bluetooth The Polk Signa S4D soundbar brings Dolby Atmos 3.1.2 audio to your home in a slim, sophisticated package. Engineered for immersive 360° sound, its seven-speaker array, complete with dedicated height speakers, creates a multidimensional listening experience. Whether you're watching the latest blockbuster or gaming with friends, you'll feel completely surrounded by sound. With a wireless subwoo