Polk Audio FXi A4 Dipole / Bipole Surround Speaker Pair

Product Research

  • Driver Technology
  • Enclosure Design
  • Connections
  • Mounting Options

Driver Technology

Dynamic Balance:

  • Dynamic Balance is a proprietary Polk Audio technology using laser imaging to determine what combination of speaker materials create the least amount of resonance.
  • Eliminating resonance in speakers results in a wide, smooth response and low distortion.

Polymer Composite Woofers:

  • Each speaker features a 5.25" polymer composite woofer for smooth wide-range response with low distortion.
  • For high performance durability, each woofer uses a butyl rubber surround.

Silk/Polymer Tweeters: 

  • Each speaker has dual 1" silk/polymer dome tweeters that provide clear, detailed highs and spacious surround effects.
  • Each tweeter uses a heat sink on the Neodymium magnet for superior heat dissipation, power handling and reliability.

Frequency Response: 

  • The overall frequency response is 50Hz-27kHz and the -3dB frequency response is 60-26kHz.

Enclosure Design


  • Each enclosure has a triangular shape with the speaker faces angled at 45 degrees.
  • One face has a tweeter and a woofer, while the other face has a tweeter and port tube opening.
  • A switch for selecting Dipole or Bipole operation is located on the rear of the speaker above the speaker's 5-way binding post speaker terminals.
  • One of the speakers is specifically designed for the "left" channel and the other for the "right" channel.

Acoustically Inert Cabinets:

  • Each speaker cabinet features all-MDF construction with internal bracings that virtually eliminate sound-muddying resonance.
  • The speakers are finished in either a black or white laminate finish.

Anti-Diffraction Grilles:

  • The floating anti-diffraction grilles minimize grille diffraction for spacious, 3-dimensional imaging.


  • On the side with only a tweeter, there is a single port tube opening for increased and extended bass response.


5-Way Binding Posts: 
  • The gold-plated 5-way binding posts will accept bare wire, pin connectors, spade connectors, banana plugs, and dual banana plugs.
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