You have to purchase the vizio setup with the additional speakers in tier levels: sound bar: sound bar sub woofer: sound bar sub woofer 2 additional speakers. These devices are manufactured together and are only compatible with what is shipped in the box. Unfortunately you cannot upgrade by first buying the sound bar. There are options to Warrenty your purchase through Best Buy or vizio to make sure if something should happen to a remote or one of the speakers that you can replace your product. You can make out going wired connection to off brand speakers with rca aux hdmi coaxial aux spdif toslink, but you do lose some quality and features by your own design.