Selling a pair of Polk's f/x 300i dipole/bipole surround speakers in mint condition. About the Polk f/x 300i For subtle, detailed surround effects for your high-performance home theater, check out Polk's f/x 300i dipole/bipole speakers. You'll enjoy a great mix of direct and indirect sound, thanks to the 45º angled driver arrays. Housing a 3/4" silk dome tweeter and a newly redesigned 5-1/4" Dynamic Balance® driver on one baffle, and a second matching tweeter on the other, these little gems really sparkle. A dipole/bipole switch changes the phase relationship between driver arrays for lots of placement flexibility. Also includes a keyhole slot for wall-mounting. Details: frequency response 55-20,000 Hz (-3dB) 8-ohm impedance sensitivity 89 dB handles up to 100 watts 5-way binding post connectors vinyl finish 12"H x 9"W x 8-1/2"D