About the Polk Audio FXi A4
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.
- bass-reflex (ported) design
- frequency response 60-26,000 Hz (-3dB)
- recommended amplifier power: 20-125 watts
- two 1" silk/polymer dome tweeters
- 5-1/4" Dynamic Balance® polymer composite woofer
- 8-ohm impedance
- sensitivity 88 dB
- dipole/bipole switch
- keyhole slot for easy wall-mounting
- 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
- MFR # AM4425-B
What's in the box:
- 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)
- Online registration sheet
- Polk Audio product brochure
More details on the Polk Audio FXi A4
Features & specs
|Bipole or Dipole||Switchable|
|Midrange size (inches)||---|
|Woofer size (inches)||5-1/4|
|Connector Type||5-way post|
|Frequency Response||60-26k Hz|
|Height (inches)||12 1/16|
|Width (inches)||11 5/16|
|Depth (inches)||7 13/16|
|Mounting Bracket Included||Keyhole|
|Parts Warranty||5 Years|
|Labor Warranty||5 Years|
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: 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.
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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