Polk Audio CSiA4 Compact High Performance Center Channel Speaker

Model: CSIA4BLK UPC: 747192118471 Item: 82


Regular Price: $249.00

Save: $100.00 (40%)

Color: Black - In Stock

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754 Route 309 (Bethlehem Pike) Montgomeryville, PA 18936
  • Mon: 9:30am - 8pm
  • Tues - Fri: 9:30am - 6pm
  • Sat: 9:30am - 5pm
  • Sun: 12pm - 5pm
(215) 368-8343
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38 Greenfield Avenue, Ardmore, PA 19003
  • Mon - Fri: 10am - 6pm
  • Sat: 10am - 5pm
  • Sun: CLOSED
(610) 649-7002
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The High Performance Heart of Home Theater

The CSiA4 is a high performance center channel speaker for smaller rooms and challenging placement situations. It features two 5 1/4" Dynamic Balance drivers, one 1" Dynamic Balance dome tweeter for spot-on imaging, seamless soundstage and natural sounding voices. With the asymmetric cabinet design, you gain the flexibility to placing the CSiA4 above or below the TV and aim it at your position.


  • The proprietary curved, 6-layer DAHLI enclosure design creates the optimal shear damping for a more rigid, acoustically inert enclosure and minimal cabinet resonances.
  • 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 Polk's 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 life-time of reliable sound.
  • The RTiA 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.
  • Beautiful curved furniture-grade hardwood veneer cabinet finishes, with sleek trim accents in black or cherry.
  • 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, for the most secure connection options.



  • Dimensions (W x H x D): 20" x 6.875" x 8.75"
  • Weight: 15.5 lbs.
  • Front array driver complement: (2) 5.25" diameter midrange, (1) 1" diameter tweeter
  • Total frequency response: 55Hz - 27kHz
  • Sensitivity (1 watt @ 1 meter): 89dB
  • Lower and upper -3dB limits: 65Hz - 26kHz
  • Recommended amplifier power per channel: 20 watts - 180 watts


What's in the Box

What's in the Box:

  • CSiA4 Compact High Performance Center Channel Speaker



Customer Reviews for Polk Audio CSiA4 Compact High Performance Center Channel Speaker

4.9 / 5.0
11 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Really woke up surround system
Excellent sounding center channel! Provide so much more depth to my system. Clear and clean
April 12, 2019
3 weeks ago
Movie Room
Matched this with some other Polk speakers for our new movie room. This center speaker puts out great sound!
November 17, 2017
1 year ago
Outstanding sound
June 25, 2012
Originally posted at
Polk Audio
Incredible sound from this unit. I have this hooked up to an Onkyo 606 RTiA3, in front and some cheap Pioneer cubes as rears(for now) and a Martin Logan Dynamo sub. Get compliments from everyone that comes here. The A4 is one of the more amazing sounding unit I have seen. I have had this unit for about a year and a half and I couldn't be happier.
September 2, 2011
Originally posted at
Polk Audio
this is a very good center for the buck...cant beat polk for value
the highs are nice and crisp, good punch at the low end ... I have the csi a4, with RT 1000P front,FX 300 at the rare, and cs175 as back surrounds.
July 30, 2011
Originally posted at
Polk Audio
pretty big cabinet that reproduce's sound that fill's even a big living room like mine.
April 12, 2009
Originally posted at
Polk Audio
I absolutely LOVE my new center channel. I intend to upgrade to all RTi speakers. There is a level of clarity and detail that I didn't have before. And, the bass response REALLY surprised me!
February 14, 2009
Originally posted at
Polk Audio
Just bought this speaker to go along with my 5.1 system and is excellent. Great design matches the rest of my system and the sound is superior to all previous center channels i have owned. Great speaker
February 12, 2009
Originally posted at
Polk Audio
Excellent sound, in both music and movies. It is working with a Yamaha receiver RX-V861,a pari of Monitor 60 (Tower, a set of FXi-A4 and Velodyne DLS-R3750 subwoofer.

I read in some bad reviews about CSi3 related to music performance. This unit sound great in both. The dynamic range is deep and the balance between bass and treble is ok.

Stylized line.
June 19, 2008
Originally posted at
Polk Audio
terrific, clear really adds a lot to 7.1 surround system
May 23, 2008
Originally posted at
Polk Audio


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Why did you choose this?
World Wide Stereo Store
Great reviews and awesome price
Jason W on Feb 7, 2019
Great reviews and awesome price
Jason W on Feb 7, 2019