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Polk Audio CSi A4

Center channel speaker (Black)

61 Reviews | 4 questions - 20 answers


Our take on the Polk Audio CSi A4

Crisp dialogue from a solidly built center channel

Complete your Polk home theater system with the CSi A4 center channel speaker. Its advanced driver technology and solid construction work together to deliver clear, distinct movie dialogue and exciting special effects. Polk carefully designed the woofers and tweeter using laser testing to help identify and eliminate resonance points. The acoustically inert MDF cabinet fights internal vibrations that can compromise performance. It all adds up to smooth, accurate sound with DVDs and multichannel music sources. And a real wood veneer finish gives this speaker a warm, refined look, making it an attractive addition to just about any room.

Grille-off shot

Lifestyle shot cabinet

The asymmetric cabinet helps fight vibration for clearer sound.

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Just what I was looking for, nice size goes well with my RTi A1

Bob, Charlottesville, VA

What's in the Box:

  • Black center channel speaker
  • 4 Self-adhesive rubber feet
  • Owner's Manual
  • Online registration sheet
  • Polk Audio products brochure

Product Highlights:

  • video-shielded
  • bass-reflex (ported) design
  • frequency response 65-25,000 Hz (-3dB)
  • handles 20-180 watts
  • 1" Dynamic Balance® silk/polymer tweeter
  • dual 5-1/4" Dynamic Balance polymer composite woofers
  • 8-ohm impedance
  • sensitivity 89 dB
  • 5-way binding post terminals
  • real wood veneer finish
  • 20-1/16"W x 6-7/8"H x 9-1/16"D
  • warranty: 5 years
  • Our 60-day money-back guarantee

Polk Audio CSi A4 Reviews

Average Customer Review(s):

(61 Reviews)
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Hands-on research

Features and Specs

Enclosure Bass Reflex
Tweeter Dome
Midrange size (inches) ---
Woofer size (inches) 5-1/4
Connector Type 5-way post
Power Range 20-180
Sensitivity 89 dB
Impedance (Ohms) 8
Frequency Response 65-25k Hz
Height (inches) 6-7/8
Width (inches) 20-1/16
Depth (inches) 9-1/16
Weight 15.5 lbs
Parts Warranty 5 Years
Labor Warranty 5 Years

Product Research

Driver Technology
Enclosure Design
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: The speaker features two 5-1/4" polymer composite woofers for smooth wide-range response with low distortion. For high performance durability, each woofer uses a butyl rubber surround and an acoustically inert stamped driver basket.

Silk/Polymer Tweeter: The speaker has a 1" silk/polymer dome tweeter that provides clear, detailed highs. The tweeter uses a heat sink on the Neodymium magnet for superior heat dissipation, power handling and reliability.

Frequency Response Note: The overall frequency response is 55Hz-27kHz and the -3dB frequency response is 65-25kHz.

Enclosure Design

Acoustically Inert Cabinet: The speaker cabinet features all-MDF construction with extensive internal bracings that virtually eliminate sound-muddying resonance.

Port: There is a single port tube opening on the front of the speaker for increased and extended bass response.

Anti-Diffraction Grille: The floating anti-diffraction grille minimizes grille diffraction for spacious, 3-dimensional imaging.


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

Reversible Design: If the speaker must be positioned below ear level, you can turn the cabinet upside down, allowing the drivers to fire upward.

Magnetically Shielded: The speaker is magnetically shielded, allowing you to place it on your television without distorting the picture.

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 verify what’s in the box, 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.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

Superb center channel for a medium space! [ David  Mar 09, 2017 ]
I love Polk Audio great speakers [ Steven  Dec 24, 2016 ]
For the price, there is no better sound then Polk speakers [ Kenneth B.  Dec 03, 2016 ]
It was Black, matched with the front floor speakers that I bought. Why to you ask? [ Gary  Sep 26, 2016 ]
Needed a quality center channel speaker to pair with my other Polk speakers. This item fit the bill and sounds fantastic in my Living Room. [ ROBERT  Jul 01, 2016 ]
yes [ GARY  Jun 23, 2016 ]
JUST LIKE POLK SPEAKERS [ robert  May 11, 2016 ]
Have been a fan of Polk Audio speakers for over 30 years. Needed a new center channel speaker for my 7.2 surround system and the CSi A4 is matched to my Rti front tower speakers. [ Anthony  May 02, 2016 ]
Good value for price point for a center channel speaker. [ Francesco Del  Apr 25, 2016 ]
reviews [ mark  Mar 15, 2016 ]
I have other Polk speakers and this one is designed to work with the other ones. [ ANDRES  Feb 20, 2016 ]
I recently purchased the RTI series tower and bookshelf speakers and these supposed to be voiced matched to them. [ Benedicta  Feb 06, 2016 ]
Size and brand and price. [ suren  Jan 24, 2016 ]
Needed a center speaker for the movie room [ Elizabeth  Dec 29, 2015 ]
It has the power I was looking for for my surround system..and the price was right. [ CURTIS  Dec 25, 2015 ]
We've had an A4 center speaker for 5 years. Recently our Son in Law was shopping for one, so we mentioned how happy we are with our Polk A4. He listened to several speakers, and ultimately chose the A4. We decided to give it to him and our daughter for a Christmas gift. Ho-ho-ho! [ GERALD G  Dec 09, 2015 ]
Service, price and free delivery. [ David  May 25, 2017 ]
completing my system [ paul  Apr 25, 2017 ]
Reading the reviews. [ Brent  Jan 15, 2017 ]
to match rtf speaker [ Christopher  Dec 18, 2016 ]
Compatibility with my RTi Ai front speakers. [ WILLIAM R  Dec 11, 2016 ]
Adviser recommend based on plan use, listening preference, and room size. [ MARK C  Nov 22, 2016 ]
Size and weight that would fit on the mount on top of my plasma tv. I also own a set of RTi A1, they have nice sound and are built solid. Polk audio has good build quality for the cost. [ Scott  Oct 26, 2016 ]
Voice matched to existing speakers. Sized right for location. [ Dean  Mar 06, 2016 ]
to match bookshelf speakers [ Joshua  Feb 05, 2016 ]
Good price- Good size- Good reviews [ PAUL  Jan 31, 2016 ]
I already have an A6 which I love. I need another center speaker for the smaller room [ ZEV  Jan 24, 2016 ]

4 questions already asked

You have asked an interesting question. So, I tuned my speaker on its end to learn how to answer your question. The best answer is no however, since I have several small items standing in front of my speaker more of the sound comes through into my room when it is standing on end. The sound projection is less restricted but only because my small objects are not in the way of the sound any longer. [ GEORGE  Oct 14, 2015 ]
It has two holes in back to mount to wall no specific brackets with speaker [ MICHAEL  Aug 16, 2014 ]
No, there is no wall mount option. You will need to install a shelf. [ CYNTHIA  Aug 16, 2014 ]
No, it doesn't. [ TIAN  Aug 16, 2014 ]
No, but it's an excellent center speaker. [ Sheila  Aug 16, 2014 ]
no [ WILLIAM T  Aug 15, 2014 ]
No, it us a shelf speaker. Don't know if they might have a wall mount for it but mine does not. I recommend the speaker. [ GARY  Aug 15, 2014 ]
No wall bracket, but the speaker lugs are offset and recessed so that you could attach one. If I was going to put it on a wall I would set it on a small, decorative shelf. Fortunately I have the tools with which to make one. [ MAURICE  Aug 15, 2014 ]
That shouldn't be an issue as the back is sealed. Mines actually on a bottom shelf so I turned the speaker upside down to direct sound upward into the center of the room~ [ CHRISTOPHER C  Feb 21, 2015 ]
It shouldn't really affect the sound. This is an enclosed speaker and it sounds and looks great. [ ANTHONY J  Feb 20, 2015 ]
Thanks for the quick reply! [ Steve  Feb 20, 2015 ]
Thanks Edward! [ Steve  Feb 20, 2015 ]
My A4 Cherry sits on my fire place mantle which is 12" deep and I have it all the way back against my stone wall. I am impressed with the sound that I get from this center channel. The sound will be directed straight toward the listening area. [ RONALD  Feb 20, 2015 ]
I also have a narrow shelf for this speaker. I don't believe you will have any problems. It's a great speaker for center channel. [ LES  Feb 20, 2015 ]
Absolutely, because the bass port is in the front and all the sounds are coming towards the listening area. This center channel speaker is awesome! [ DORAN L  Feb 20, 2015 ]
I feel placing the speaker in the back of the cabinet would degrade the sound quality. With the speaker placed just inside the opening,at the edge of the shelf you will be able to enjoy the quality of the Polk speaker. That's just my opinion. [ GENE  Feb 20, 2015 ]
Yes, I am using this as a center channel Speaker mounted in a sliding drawer in my cabinet. It is approx 10" deep & just tall enough for the speaker. I am using it with a pair of Polk Audio Towers in the front & Mirage Speakers in the back. The sound is excellent & I am very happy with it. [ EDWARD A  Feb 20, 2015 ]
i believe so-mine is in a cabinet with only a few inches to spare and it sounds great [ JUDD  Feb 20, 2015 ]
It comes in a solid heavy box I think it would be fine , mine sits in a cabinet and it sounds great! [ JAMES A  Feb 20, 2015 ]