Dolby Digital 5.1 DTS Virtual:X: Multi directional sound draws you into the action with Dolby Digital 5.1 capable and DTS Virtual X. Bass Boost:Boost the bass with a touch of a button. Built in Center Speaker: The built in center speaker delivers enhanced dialogue so you won't miss a word. Subwoofer Included: Experience the intensity of action movies with the powerful bass coming from the included subwoofer. Adaptive Sound Lite: Enjoy optimized audio with enhanced voice clarity on all your favorite video content. This pre-owned or refurbished product has been professionally inspected and tested to work and look like new. How a product becomes part of Amazon Renewed, your destination for pre-owned, refurbished products: A customer buys a new product and returns it or trades it in for a newer or different model. That product is inspected and tested to work and look like new by Amazon-qualified suppliers. Then, the product is sold as an Amazon Renewed product on Amazon. If not satisfied with the purchase, renewed products are eligible for replacement or refund under the Amazon Renewed Guarantee.