Polk Audio FXiA4 Bipole – Dipole Surround Speaker (Pair)


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Full Fidelity and High Performance

The F/XiA4’s engine is the dual Dynamic Balance® 1-inch dome tweeter design and a 5 1/4-inch Dynamic Balance driver that produces believable real-life effects at prodigious volumes. The selectable bipole/dipole function allows you to configure it to your space and 7.1 systems. The smaller cabinet enables it to fit in more places.

Key Features

  • The trapezoidal shaped cabinets aim the drivers and tweeters in opposing directions to produce a more realistically diffuse wavefront and wide, lifelike imaging of surround sound. Keyhole slots make mounting a snap.
  • With the flip of a switch, our dipole/bipole circuitry changes the soundfield from direct to indirect radiation patterns enabling you to place the surround speaker beside or behind you depending on your listening room setup.
  • Klippel motor optimization uses laser measurement technology to ensure a smooth excursion path at either end of the volume spectrum for uniform performance at both low and high volumes.
  • Polk’s proprietary, patented Dynamic Balance technology allows our engineers to design out distortion-causing driver and system resonances, so you only hear the good sounds.
  • Durable, computer-modeled, injection-molded butyl rubber surrounds suppress unwanted cone resonances for a lifetime of reliable sound.
  • The POLK fxi-a4 Cascade Tapered Crossover eliminates the comb filtering and beaming, common to multi-driver speakers, which degrades the quality of the audio and collapses the soundstage.
  • Patented Acoustic Resonance Control® (ARC) technology suppresses cabinet resonance that causes distortion to ensure clear and natural sound.
  • Computer-modeled anti-diffraction grilles enhance the good looks while minimizing sonic interference.
  • All Polk loudspeakers are timbre-matched within their series, designed with the same components throughout, to achieve seamless speaker-to-speaker blending effects in multi-channel systems.
  • Gold-plated, professional-style 5-way binding posts offer the most secure connection options.



Total Pieces : 2


Cabinet Warranty : 3 years

Drivers Warranty : 3 years

Original Purchaser Only : Yes


Carton 1 : 16″ (40.64 cm) h x 19.5″ (49.53 cm) w x 14.5″ (36.83 cm) d – 24 lbs (10.89 kg)


Qty Included Pair

Orientation : Horizontal

Height : 12″ (30.48 cm)

Width : 11.375″ (28.89 cm)

Depth : 7.437″ (18.89 cm)

Weight : 9 lbs (4.08 kg)

Driver Enclosure Type : Acoustically Tuned Vent

Driver Complement

(1)  5.25″ (13.34 cm) d (Round) Dynamic Balance driver with polymer composite cone and rubber surround – Mid/Woofer

(2)  1″ (2.54 cm) d (Round) Dynamic Balance silk polymer composite dome – Tweeter


Mounting TypeKey : hole Hanger

Available Orientations : Horizontal


Total Frequency Response : 50 Hz ? 27,000 Hz

Nominal Impedance : 8 ohms

Lower and Upper -3dB Limits : 60 Hz ? 26,000 Hz


Audio Inputs

Speaker Inputs : (1) Pair of 5-way Binding Posts – Gold Plated


Recommended Amplifier Power Per Channel : 20 watts ? 150 watts


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