This product is a vintage Polk model and is not available for sale, but it may still be available in some stores as a closeout or used product. The following text is taken from the original sales brochure for this product and does not reflect current availability. If you happen to have any question or concerns about this product, or any other Polk Audio product, feel free to contact our Customer Service Department at 1-800-377-7655 Monday - Friday, 9am - 5:30pm EST


Bi-Directional Surround FX Speakers

Available Finishes:

The Simple Choice For Surround Performance

Do You Need Bi-Pole/Di-Pole Therapy?

The next time you're in a movie theater, look around. See all those speakers lining the side and rear walls? They are surround sound speakers. They receive a special soundtrack channel of dedicated sound and with it, they encircle the audience in sound. Encircle is another word for "surround." It's this "surround" effect that puts you in the center of the movie action in the theater. Multiple speaker sets on the walls of large theaters work by throwing the sound hither and yon, all around the room.

It's pretty impractical for you or I to install multiple pairs of big surround channel loudspeakers in our home theaters.
To get the same effect, we can use bi-directional (bipole/dipole) speakers, which have drivers facing opposite directions on a triangular cabinet.

This arrangement spreads sound along the side walls of our home theaters, making it "harder" for us to identify the location of the surround speakers (and thus providing a more realistic, defused sound for a more enveloping experience. Enveloping is also another word for "surround," in this case.)

What's wrong with using normal direct-radiating bookshelf speakers for surround channels? Nothing much. You can usually aim them to get a satisfactory soundscape. Bi-directional speakers give you far more installation options because you can change their radiation pattern for the optimum performance depending on the seating setup of the room in which you watch multi-channel movies.

FXi30 features:

  • Reformulated poly-composite Dynamic Balance drivers with butyl rubber surrounds for durability and smooth wide range response.
  • 1" silk/polymer composite dome tweeters for clear, detailed highs.
  • Perfect timbre-matching with the other speakers in the Polk Audio RTi Series, for a more realistic, more seamless surround environment.
  • Triangular cabinets aim drivers and tweeters in opposing directions to produce a diffuse wavefront for wide, lifelike imaging of surround-sound FX.
  • Switchable bipole/dipole operation for the most flexible placement options and highest performance surround effects.
  • Strong, durable built-in wall mounting brackets for easy installation.
  • Gold-plated 5-way binding post inputs for the most secure connections and the most versatile wiring applications.

Driver Complement

Diameter1" (2.54cm) 
TypeDynamic Balance® silk/polymer composite domes, shielded 
Mid / Woofer
Diameter5 1/4" (13.34cm) 
TypeDynamic Balance® driver, shielded 


Total Frequency Response50Hz-27kHz 
Upper -3dB Limit26 kHz
Lower -3dB Limit55 Hz
Nominal Impedance8 ohms
Efficiency89 dB
Radiation PatternSwitchable Bipole/Dipole 
Recommended Amplifier Power10-100 watts per channel
Inputs5-way binding posts 

Amplifier Specs

Amplifier Type


Cabinet Dimensions
Height11 1/2" (29.21cm) 
Width9" (22.86cm) 
Depth7 7/8" (20.00cm) 
Mounting OptionsBuilt-in keyhole slot wall-mount brackets supplied 
Product Weight (each)12.00 pounds


Unit of Measureeach 
Total Shipping Weight25.00 pounds


Speaker Warranty5 years parts and labor, limited 

Specifications, dimensions and features subject to change without notice. For more information call us at 1-800-377-7655 (USA and Canada). Outside of North America call +1 (410) 358-3600.

F/Xi30 Media

F/Xi30 Literature

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F/Xi30 Accessories