Polk Audio CSiA6 High Performance Center Channel Speaker

Model: CSIA6BLK UPC: 747192118495 Item: 81


Regular Price: $399.00

Save: $160.05 (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: 12:00pm - 5pm
(215) 368-8343
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38 Greenfield Avenue, Ardmore, PA 19003
  • Mon - Fri: 11am - 6pm
  • Sat: 10am - 5pm
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(610) 649-7002
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The Voice of a Flagship System

The center channel speaker is arguably the most important speaker in your home theater system. It's in the middle of all the action and, more importantly, it's the anchor for all dialog. If you want to hear what the actors and actresses are saying, buy a good center channel speaker. The CSiA6 is the perfect center piece for a big screen TV or a large room. And it's timbre-matched to the RTiA series speaker so you can build a seamless 360° experience. Its massive dual 6 1/2" Dynamic Balance midbass drivers and 1" Dynamic Balance dome tweeter will dish out explosive sound and crisp clear dialog. It's best paired with the larger tower or bookshelf speakers.


  • The unique angled top allows the CSiA6 to be inverted so you can place the speaker below your TV and still enjoy great sound.
  • A unique kickstand assembly that provides rear support to many projection TVs (will not work with plasmas or other TVs with completely flat rears).
  • 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 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 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.
  • PowerPort bass venting is Polk's patented design for smoothly transitioning the air flow from the port into your listening area, eliminating turbulence and distortion, for bigger, more musical, deep bass impact.
  • 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.
  • Dual gold-plated, professional-style 5-way binding posts, for the most secure connection options.
  • Dual binding posts allow bi-amp or bi-wire connections, for the ultimate in customized high performance audio.



  • Dimensions (W x H x D): 24" x 7.75" x 14"
  • Weight: 29 lbs.
  • Front array driver complement: (2) 6.5" diameter mid/woofer, (1) 1" diameter tweeter
  • Total frequency response: 45Hz - 27kHz
  • Sensitivity (1 watt @ 1 meter): 90dB
  • Lower and upper -3dB limits: 55Hz - 26kHz
  • Recommended amplifier power per channel: 20 watts - 200 watts


What's in the Box

What's in the Box:

  • CSiA6 High Performance Center Channel Speaker



Customer Reviews for Polk Audio CSiA6 High Performance Center Channel Speaker

4.9 / 5.0
32 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
April 13, 2019
7 months ago
February 11, 2019
Awesome center speaker by Polk!
November 27, 2018
Clear Detailed Spacious Vocals
I purchased the CSi A6 Center Channel Speaker on 12/18/14 to compliment my Bi-amped Polk Monitor 70 Tower Speakers and SVS SB-1000 Subwoofer using a Onkyo AV Receiver, Dune HD Media Player, and OPPO Blu-ray Player.

I liked the specs: 55-26k Hz frequency response, 90 dB Sensitivity, 20-200 watts power range, 6-1/2" woofer and dome tweeter in a bass reflex forward ported cabinet all combined to produce clear detailed spacious vocals without being harsh and overbearing or sounding "boxy".

It's important to set the center channel speaker configuration Crossover Frequency settings in your AV receiver to your sound preference and listening area dimensions. THX recommends setting the crossover frequency at 80Hz but I prefer setting it to full band.

After four months using the CSi A6, movies, music, and even regular TV all sound great. I am very happy with it. It was money well spent and I expect it to last for many years of listening pleasure.
April 27, 2015
Originally posted at
Polk Audio
Great Balanced Audio and Soundstage
I have had this speaker now for about a week- not even broken in yet. I was a little concerned since I was replacing a relatively new TSX250c Center that I was pleased with. I replaced it because I have RTiA3's for fronts and RTiA1's for surrounds. I noticed the TSX was not really timbre matched with my other speakers. The TSX has a good balance of tones from top to bottom. I was worried about losing that balance and the crispness of the speaker. My worries couldn't have been more wrong. The CSiA6 has great rounded sound, a wide soundstage and hits the highs as well as the lows, and everything in between. My system now sounds complete as this center matches my other speakers providing fluid sound and continuity.

It does seem to be power hungry. Audyssey previously set my TSX at -6 to -5.5 when running setup. Audyssey sets this Center to -1.5 and I increased it by 1db to stand out a little from the surrounds to better hear dialogue.

Overall, I made a good choice in purchasing this speaker and should have gone with it in the first place. I was trying to save pennies by going with the TSX without the previous understanding of how important it is to have your speakers match. After hearing it, I get it now.

As a side note, many people blanket their crossover frequencies at 80 not paying attention to whether the speakers are capable of those frequencies. I did the same with my previous setup. The result is worst sound and over working of the receiver. When you have speakers that can handle the crossover frequency, the sound is more robust, clear and natural. This Center, the CSiA3 and the RTi speakers can handle the frequencies and I notice a huge difference in the quality of sounds.

Buy it, you want regret it.
May 7, 2014
Originally posted at
Polk Audio
Perfect to say the least
I have purchased the CSIA6 along with 2 RTI A9, 4 RTI A7, and 2 RTI A5 to complete my Home Theater for a 9.2 setup. The sound is amazing for movies and music, but the main purpose for doing all floor standing speakers was for some seriously loud, clear, concise sound and these all deliver the quality I was hoping for. My old setup was coming from Paradigm with 2 fronts floor standing, 2 di-pollar floor standing, 2 book shelves and center channel of course. They were great and when making the move to Polk I was really hoping for that same quality of sound and was happy that Polk's RTi speakers exceeded my expectations. I am very happy with this setup.
April 6, 2014
Originally posted at
Polk Audio
**Center of bass**
.....iHave'nt even pushed it wide open yet and the lows had me greatly satisfied. I just upgraded from the TSi CS 20. And I thought that was a great center. But this bad boy took the cake. It's worth the extra bread if you where thinking about the A4.
August 7, 2013
Originally posted at
Polk Audio
I was debating on this center for a long time now to match my RTi12's and I was so so glad I did get this center, they blend beautifully together. In my setup I have this beautiful center (cherry finish) with a DSW PRO400 with the Polk RAti12's mains bi-wired and rears I have ODS Kevlar 6.5" 2-ways with 1"silk tweet and my sub stage two martin logan dynamo
April 20, 2013
Originally posted at
Polk Audio
I did something a little different when i purchased the CSIA6 center speaker on July 19,2012 .. First i removed the Gold Bussbars from CSIA6 terminals then i bi-wired the monster to my TX-NR Onkyo 1009 with double banana plugs which were piggy-back on the Center speaker terminals on the receiver to feed signal to the Mid-woofer and Tweeter independently ...I don't believe in mix-matching my speakers , i want everything to come from the same house .. So by adding the monster to my TX-NR Onkyo 1009 i'm able to push 9 Polk speakers , 5 in the front and 4 in the rear plus the Sub.. For the money i laid out i expect to get as much as i can from this Bad Boy ... I intend to utilize the Normal power as well as the Dynamic power from the 1009 to feed this very "Efficient" speaker... I'm very very satisfied with the quality of the sound coming from this monster..
Since the normal hearing range is 20Hz to 20KHz the Tweeter highs(a falsetto 27KHz) are noticed when a Xylophone, Cymbals,Piano or String instruments are being played along with any other high note that's detected.. The Mid-Woofer(45Hz,= a mini Baritone..!!!) vocals are Super clear from my DVD's,Tuner,CD's and Direct TV and there are times when audio sounds somewhat three dimensional .. No more adjusting the volume, now the audio is strong and true... I have absolutely NO complaints , i'm proud and very happy with this handsome behemoth and the way it blends with my RTi12's and i would like to add i'm using the speaker "Bussbars" that's the gold speaker terminal clamps which help my RTi12's soundfield and imaging .. Some guy's fail to use these Bars but they feed signal to both sets of Speaker terminals.. If you buy the CSIA6 Center Masterpiece, you won't regret it ,this is some piece of work ...
July 26, 2012
Originally posted at
Polk Audio
I bought this 3 days ago after reading numerous reviews about how the center channel is the most important speaker in your home entertainment center I decided to go BIG or go home. I have all sorts of products from Bose but decided after hearing a good friends system to try Polk I bought this with a pair of matching rti a3's. Needless to say this are amazing right out of the box they need to be set as large and 60hz on you receiver. The imagery in this center is fantastic while watching a movie everything pops and is very clear. The tweeter is pristine very clear and not enough to make your head hurt even while putting your ear up to them on a loud setting. Mid bass is complete there's not a frequency missing and for lows well... Depending on your musical preference I have this with the matching bookshelves speakers and don't really need a sub on for watching most movies. The clarity is so well I was cleaning with the tv on their was a loud scene on my be for a commercial for a new action movie I was near my right speaker and jumped. While this is on at any volume it is clear and crisp no rattling or distortion of any frequency. I have a new onkyo receiver 5.1 85 watts a channel these take advantage of that receiver and push to their full potential. It wonderful expecially coming from a Bose lifestyle to this. I'd give it 100 stars if possible thanks for making me a believer Polk.
January 20, 2012
Originally posted at
Polk Audio


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