Typically refers to a speaker in a home theater system that is placed behind or on the side of the listening area. See surround sound.
"satellite speaker." YourDictionary, n.d. Web. 17 August 2018. <http://www.yourdictionary.com/satellite-speaker>.
satellite speaker. (n.d.). Retrieved August 17th, 2018, from http://www.yourdictionary.com/satellite-speaker