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Polk Audio FXi A4

Dipole/bipole surround speakers (Black)

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  • Polk Audio FXi A4

    Front

 

Our take on the Polk Audio FXi A4

by Loren Barstow
Polk Audio

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
     

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

    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
    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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    Polk Audio FXi A4 Reviews

    Average Customer Review:

    8 people say:

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    5 out of 5

    Polk Audio FXi A4

    Written By Dee, Alabama on Sunday, January 05, 2014
    Crutchfield Customer Review (What's this?)
     
    Bought as a gift for the hubby. He loves them. Truly enhances the surround system.
    1 out of 1 people found this helpful
    Was this review helpful?    Yes | No
     
    5 out of 5

    Polk Audio FXi A4

    Written By JohnB, San Jose, Ca on Sunday, January 05, 2014
    Crutchfield Customer Review (What's this?)
     
    Rounds out my speaker upgrade, two Polk Audio TSx550T for the front, Polk Audio TSx250C center and these two for the rear. Great surround in rear, does not appear to be focused. Overall very satisfied with the performance thus far
    Pros:
    Great sound, nice appearance
    Cons:
    None
    Was this review helpful?    Yes | No
     
    5 out of 5

    awesome..

    Written By marlin, orange,nj on Thursday, January 02, 2014
    Crutchfield Customer Review (What's this?)
     
    glad with the deal from Crutchfield.... professional sound in my living room... afordabble...
    Pros:
    quality.
    Cons:
    none
    Was this review helpful?    Yes | No
     
    5 out of 5

    Bang

    Written By Ted, Odessa, Tx on Thursday, November 21, 2013
    Crutchfield Customer Review (What's this?)
     
    The speakers are a decent size. I was watching a moving and i will admit i got scared. The sound that these speakers produce is impressive. It caught me off guard and made me jump. They integrate well with the rest of my polk speakers. This is a good buy.
    Pros:
    Price, sound, easy to mount
    Cons:
    I wish it had another driver on the other side.
    1 out of 1 people found this helpful
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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.
    1 out of 4 people found this helpful
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    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
    9 out of 9 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.
    19 out of 19 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.
    37 out of 40 people found this helpful
    Was this review helpful?    Yes | No
     

    Add accessories for the Polk Audio FXi A4

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