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Polk Audio FXi A4

Dipole/bipole surround speakers (Black)

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  • Polk Audio FXi A4

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Item# 107FXIA4B offer details

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Polk Audio

Our take on the Polk Audio FXi A4

by Loren Barstow

Add the 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.

Dipole/bipole operation for flexible placement
A dipole/bipole switch lets you position the FXi A4s on the rear or side walls of your home theater room — you'll get great results either way. If you place them behind your listening postion, set them to bipole mode for distinct, directional sound. Or set them to dipole mode for side placement, and they'll create a more diffuse soundfield for convincing wraparound effects.

A high-tech approach to accurate sound
Polk carefully designed the drivers using laser testing to help identify and eliminate resonance points. The acoustically inert MDF cabinets fight internal vibrations that can compromise performance. It all adds up to enveloping surround sound that fully immerses you in the movie action.

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Highlights:

  • bass-reflex (ported) design
  • frequency response 60-26,000 Hz (-3dB)
  • handles 20-150 watts
  • two 1" silk/polymer tweeters
  • 5-1/4" Dynamic Balance® polymer composite woofer
  • 8-ohm impedance
  • sensitivity 88 dB
  • dipole/bipole switch
  • 5-way binding post terminals
  • voice-matched to Polk's RTi tower and bookshelf speakers and CSi center channel speakers
  • 11-5/16"W x 12-1/16"H x 7-13/16"D
  • warranty: 5 years
  • Our 60-day money-back guarantee
Priced per pair
    Shop all Polk Audio Surround (Rear) Speakers
       

      Hands-on research from the Crutchfield Labs (what are the Labs?)

      Features and Specs

      Features and Specs
      Enclosure
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      Bass Reflex
      Bipole or Dipole
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      Switchable
      Tweeter
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      Dome
      Midrange size (inches)
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      ---
      Woofer size (inches)
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      5-1/4
      Connector Type
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      5-way post
      Power Range
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      20-150
      Sensitivity
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      88 dB
      Impedance (Ohms)
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      8
      Frequency Response
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      60-26k Hz
      Height (inches)
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      12 1/16
      Width (inches)
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      11 5/16
      Depth (inches)
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      7 13/16
      Weight (pounds)
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      ---
      Mounting Bracket Included
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      Keyhole
      Parts Warranty
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      5 Years
      Labor Warranty
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      5 Years

      Product Research

      Product Research
      What's in the box?

      Download owner's manual

      • 1 Black left surround speaker
      • 1 Black right surround speaker
      • 2 Self-tapping screws
      • 8 Self-adhesive rubber feet
      • Owner's Manual (English/French/Spanish)
      • Template
      • Online registration sheet
      • Polk Audio product brochure

      Our Product Research Team

      At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

      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

      Enclosure: 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.

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

      Connections

      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.

      Mounting Options

      Dipole/Bipole Switch: There is a switch that allows each speaker to be used as a Dipole (out of phase) or Bipole (in phase) speaker. If you're mounting the speakers on the side walls in line with your listening position, the dipole mode will create a diffuse, ambient soundfield. If you're placing them behind your position, the bipole mode fires the drivers in phase to flood your room with surround sound. When used with a Dolby Digital system, the surround speaker setting should be set to small.

      Wall Mounting: The bracket on the back of each speaker has two keyhole slots, allowing the speaker to be mounted on the wall using the supplied 2-1/2" wood screws.

       

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      Reviews for the Polk Audio FXi A4

      Average Customer Review:

      4 people say:

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      4 out of 5

      Polk fx

      Written By Randy, Douglasville, GA. on Monday, May 06, 2013
      Crutchfield Customer Review (What's this?)
       
      Fast delivery, look great on the wall, sounds great.
      Pros:
      They go well with the Polk towers, great sound. Polk speakers like power and these can handle it.
      Cons:
      They do not come in cherry.
      Was this review helpful?    Yes | No
       
      5 out of 5

      well balanced sound and a great price point

      Written By Don,S, North Greenbush,NY on Sunday, February 27, 2011
      Crutchfield Customer Review (What's this?)
       
      What a great sound from these speakers smoothe and clear as a bell strong sturdy and not too heavy,and come with options also.Use as rear's you can bipole with the flip of a switch or surrounds and dipole them they sound fantastic. I was a little heasitant at first reading about them,now I would highly reccomend them at this price point. We love um
      6 out of 6 people found this helpful
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      5 out of 5

      Happy with My Choice

      Written By Brian, NW, Ohio on Wednesday, October 20, 2010
      Crutchfield Customer Review (What's this?)
       
      As I was building my component HT system, when I got to choosing the rear/surrounds I was between the FXi A4's and A6's. With size of the speakers and the size of my living room (17x15) being a big consideration, I decided to try the A4's and have not been disappointed. I've never heard the A6's but can't imagine they can sound too much better. As another review stated these A4's sonically blend very well with the rest of my system (my other speakers include a pair of Polk A7 towers and for a sub I have a Klipsch RPW-10). My receiver is giving these speakers 110 watts per channel over a 50ft total (each) length of Original Monster Cable and they sound great.

      I have mine placed on the wall in the back of the room set to the bipole mode. There certainly is a bit of a noticeable difference between the bipole and dipole modes (dipole being more scattered immersing sound if placed on the side walls).

      They sound great for movies but I use my system alot for listening to music using one of my receiver's all channel stereo modes and these A4's do very well. These do not disappoint.
      16 out of 16 people found this helpful
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      5 out of 5

      Great surround speaker

      Written By Steve, Las Vegas, NV on Saturday, February 21, 2009
      Crutchfield Customer Review (What's this?)
       
      This speaker performs very well and blends in perfectly with my other Polk speakers. Set on the dipole setting they provide immersive sound without the ability to localize the speaker.

      One thing to be careful about is that the speakers are not identical. One speaker is labeled for right surround and the other for left.
      35 out of 38 people found this helpful
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      1-4 of 4

      Accessories

      Add accessories for the Polk Audio FXi A4

      You'll need speaker wire to connect your surround speakers to your amp or receiver. No wire is included with this speaker. See all categories & accessories

      Monster Cable SuperFlat™ Mini Decor-friendly speaker cable with gold pin connectors (50-foot spool)
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      Monster Standard Speaker Cable 16-gauge, 50 feet (16 gauge, 50 feet)
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      Rated 5-stars by consumers

      For a more in-depth review and enhanced detailed information on the Polk Audio FXi A4, please visit the Crutchfield website product page (/S-wK5wtcqG7XR/p_107FXIA4B/Polk-Audio-FXi-A4-Black.html ).

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      Compare with other Polk Audio models

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      • Polk Audio LSi M 702 f/x
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        Polk Audio FXi A4