When people refer to surround sound "speakers", what they typically mean are any speakers that are connected to a surround sound "channel" on a home theater receiver. That said, certain speakers, such as our Level TWO and Level THREE Surround Speakers, can ONLY be used for these channels. Whereas most speakers are directional, these speakers are designed to be intentionally non-directional and are best used when your room leaves you no choice but to mount the surround speakers directly to the left and right of the listener.
For most other situations, any good speaker can be used to reproduce a surround channel. The key is understanding where to place, and how to aim, the speaker based on how the room and sitting area are arranged.
First, determine the surround sound format you'd like and that fits within your space, e.g. 5.1, 7.1, 9.2.2, etc. Then, choose speakers from this page that best fit your layout and mounting/placement options. Read more here.