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Polk Audio CSi A4

Center channel speaker (Cherry)

103 Reviews | 8 questions - 29 answers

Item # 107CSIA4C

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Was: $249.99

Special purchase: -$100.00

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Our take on the Polk Audio CSi A4

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.

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.

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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

What's in the Box:

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

This is a very nicely built center channel speaker. Very clean sound. Has some weight to it. Not sure why it is sloped in the back but don't notice when it is in my entertainment cabinet.

Ron, Connersville, IN


Polk Audio CSi A4 Reviews

Average Customer Review(s):

(103 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?

Just wanted to add a center channel to my existing 2.1 system. Lori suggested this would be good match for mine. [ Tirumalaimuttu  Nov 06, 2018 ]
From the reviews and to match my A3's. [ Richard  Sep 30, 2018 ]
I have the polk a7 [ Farley  Sep 27, 2018 ]
Dimensions of overall speaker fit my entertainment cabinet. Like the Polk product. [ Ron  Sep 18, 2018 ]
Great value / bang for the buck [ Nathaniel  Sep 03, 2018 ]
Timber match for RTi's [ G  Jun 09, 2018 ]
to timbre match my rti A3 [ Felix  Apr 01, 2018 ]
Best value for the money. Great reviews, [ James  Mar 31, 2018 ]
Have had a good history with Polk. Price and specifications did the rest. [ Tyler  Mar 26, 2018 ]
to Match other Polk speakers [ John  Mar 26, 2018 ]
Good reviews, cost, fit the area I had to place it in. [ Peter  Mar 20, 2018 ]
I like the brand. [ Eric  Feb 25, 2018 ]
The speaker will be mounted on stand on the wall [ JAMES A  Feb 18, 2018 ]
Previous purchase of polk RTi A7 and was looking for voice match plus good reviews great price [ MICHAEL W  Feb 07, 2018 ]
Just the right size for the space it needs to sit in, I like how Polk speakers sound, frequency response is very good for the size, and it pairs well with other very good speakers. [ Nicklas  Feb 02, 2018 ]
I have another Polk speaker that I'm happy with and I enjoy dealing with crutchfield. Free shipping is also a plus [ FRANK  Jan 29, 2018 ]
I picked this model over the CsiA6 because the high customer ratings and the CsiA6 would have been to large for my liking [ Parviz  Dec 30, 2017 ]
great sound [ philip  Dec 26, 2017 ]
5 star rated, polymer cone woofers [ Diane  Dec 23, 2017 ]
Compact size, good reviews [ X  Dec 16, 2017 ]
Great name Polk. And am expecting great listening, according to others reviews and specs. [ Sherry  Dec 15, 2017 ]
to pair with Polk RTiA3 already purchased from Crutchfield [ David  Dec 10, 2017 ]
reviews, and need a center to get a clear sound voices. [ Kevin  Dec 06, 2017 ]
Seemed to be a good match for my existing L/R speakers. [ William  Dec 04, 2017 ]
Good reviews. Good experience with polk speakers. [ Luis  Nov 30, 2017 ]
Recommended pairing with Polk Audio RTi A1 [ Edmund  Nov 15, 2017 ]
Polk RTIa7 [ V  Oct 24, 2017 ]
It matches bookshelf speakers. [ Kimberly  Oct 08, 2017 ]
color match furniture and right size [ David  Oct 06, 2017 ]
Great reviews, good price, great reputation [ scott  Sep 30, 2017 ]
Always wanted this Polk set-up so I am purchasing while the sale price lasts. [ Maria  Sep 20, 2017 ]
The reviews here were really helpful, so thanks to everyone that posted one. I just picked up some in-ceiling Polk Audio speakers and thought this would be a good center channel to replace a smaller, budget Yamaha center. I'm looking forward to getting this installed and giving it a listen! [ Thomas  Sep 18, 2017 ]
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 ]
To match my RTi A7's. The reviews were great. [ Guest  Nov 08, 2018 ]
Better sound [ jim  Oct 12, 2018 ]
Add sound [ Jeffrey  Jul 07, 2018 ]
It matches my bookshelf speakers. [ Adam  Jul 06, 2018 ]
I wanted something to match my polk RTi-A9's that would fit in my tv stand. The CSi A6 showed to big to fit in my space. The CSi A4 showed it would fit better and the ratings were all great. So i pulled the trigger. [ KEVIN  Jul 02, 2018 ]
Additional or surround sound [ Jeffrey  Jun 30, 2018 ]
price [ Brian  May 27, 2018 ]
I think it would blend better with the Cherry RTi 7 that I already have and the CSi 100 Cherry I recently bought from CRUTCHFIELD .Hopefully it would harmonize not only in visually but also in sound. [ RICARDO N  May 07, 2018 ]
We just purchased a 7.2 receiver, and I wanted to enhance the sound. Also, our front speakers are Polk Audio cherry speakers which match this item tonally. [ Peter  Mar 02, 2018 ]
I am upgrading my surround sound speakers. This sneaker will compliment the Polk TS-400 speakers I purchased from Crutchfield last year. [ keith  Feb 21, 2018 ]
to match my other polk speakers [ Gregory  Feb 17, 2018 ]
Experience. I own a set of Polk Speakers on another 5.1 Audio/TV system. Good value. [ Augustus  Feb 10, 2018 ]
I have had Polk products before and have always been a fan of there sound quality. [ Curtis  Feb 01, 2018 ]
Great Reviews to match Polk RTiA7's (Front) & my old rebuilt Advent Maestro's (Rear), and dimensions indicate it will fit nicely above my television in cabinet. [ Robert  Jan 16, 2018 ]
I have some other Polk Speakers which I like and I needed a replacement center channel speaker for my system. [ DAVID  Dec 22, 2017 ]
four star rating is why I choose this. [ Jim  Dec 15, 2017 ]
Needed to replace 1994 Infinity Center Channel that had finally rotted out the surrounds. It stills sounds fine even at high levels, but I want to try out this polk cc. Know I will get better sound considering the newer technology. [ Mark W.  Dec 10, 2017 ]
Previous experience with POLK audio speakers, price and cherry color. [ Guy  Nov 28, 2017 ]
Matches previously purchased speakers and component size meets my requirements. Considered CSi A6 but unit was too large. [ Tom  Nov 27, 2017 ]
Supposed to work well with my choice of the Polk RTi A9 front speakers [ Yossi  Nov 24, 2017 ]
To replace an old speaker and to match up to my Polk A7s [ Terry Parker  Nov 14, 2017 ]
I have the matching set at home and haven't purchased the center channel for the last 5 yrs. It finally went on sale and I grabbed my last speaker of the system from the only place I ever buy electronics from...Crutchfield. [ E  Oct 18, 2017 ]
I had bought the Polk RTi A3 speakers last week and came back to buy a home theater receiver and Rachel the sales rep also suggested this center channel speaker that matched what I had already bought. The price was great so I went for it! [ MICHAEL  Oct 14, 2017 ]
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 ]

8 questions already asked

Yes i am very happy with mine. it would be a good addition to any system. [ Geoffrey  May 20, 2018 ]
I think it would be a good match...I have it with my t-50s and it's more then enough.. [ Curtis  May 19, 2018 ]
Oh yeah they pair up perfectly Great Sound I love it sounds like I'm at the movies [ ISSAC  May 19, 2018 ]
I don't see why not, most of the Polk speakers are supposed to be timbre matched unless you go with something lower end. [ MIKE  May 20, 2018 ]
I would think it will match as well as the A6. [ Russ  Apr 25, 2018 ]
Yes it is a direct match for the RTi speakers [ Jonathan  Apr 25, 2018 ]
Sorry, I looked at the RTiA7, but I don't know a definitive answer. These Polk center speakers are fairly large, so be sure the AF fits where you want to place it. IMHO, it WOULD be a good match. Clarity and sound is great. BP [ Robert  Apr 25, 2018 ]
Yes - excellent choice [ ANTHONY  Apr 25, 2018 ]
Thanks for your question! For a more personalized recommendation tailored to your needs, preferences and budget, you would be best served contacting an Advisor directly by phone (888.955.6000) or online chat. They can help explain the differences between the Polk speakers in more detail and help you make a more well informed decision. [ Larry  Mar 14, 2018 ]  Staff
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 ]

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