Polk FXi A4 Surround Speaker Pair (Black)Polk FXi A4 surround speakers to your home theater system and enjoy dramatic rear channel sound effects with your favorite movies. These cleverly designed speakers feature two tweeters aimed 45 from each other, for an ideal mix of direct and indirect sound. FXi A4 is a close relative to the larger FXi A6. Like its big brother, it keeps the dual tweeter design and selectable bipole dipole configurations. It's a little smaller so it will fit in more