Polk Audio FXi A4

The Polk Audio FXi A4 are surround speakers designed to be used in rooms to provide an exceptional sound that projects across the entire environment. Similar to the FXi A6 model that's more powerful, the high-end speakers have a 5.25-inch polymer composite woofer and two 1-inch polymer composite tweeters that both have Dynamic Balance technology that helps it create a clear sound on high and low levels.

Additional features for the surround speakers include optional PowerPort for a strong bass response and MDF construction that prevents internal vibrations that can affect the speaker's sound.