The Polk Audio SurroundBar 4000 IHT 31" Virtual Surround Speaker Bar with Wireless Subwoofer delivers a vivid 5-channel sound field from a single source; no rear speakers or special room characteristics are required. The SurroundBar 4000 Instant Home Theater creates the exciting sound, Polk single-speaker systems are known for a rich, full enveloping sound with a wide stage. The SurroundBar 4000 IHT is the step-up from SurroundBar 3000 IHT because it comes with Dolby Digital, so you have even more connectivity for today's surround-encoded programming. They all sound bigger and more thrilling through the SurroundBar 4000 IHT. A sleek easy-to-use system that includes a wireless subwoofer, the SurroundBar 4000 IHT is the home theater solution without any of the traditional home theater hassles or clutter and all of the connectivity you want.