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Polk Audio CSi A4

Center channel speaker

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Item# 107CSIA4C offer details

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Polk Audio

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.


Got wire?

Most speakers don't include any. Learn about choosing and installing speaker wire at the Crutchfield Learning Center.
Shop our selection of speaker wire.

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
 

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs

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

Product Research

Product Research
What's in the box?

Download owner's manual

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

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 open the box, verify contents, 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.

Driver Technology
Enclosure Design
Connections
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.

Connections

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.

 

Product Reviews

Review Summary

Average Customer Review:

13 people say:
(10)
(2)
(1)
(0)
(0)
 

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1-10 of 13 items >> Sort Results By: Date Reviewed | Rating | Helpfulness
 
5 out of 5

Polk Audio CSi A4

Written By ira_l, Ossining, NY on Thursday, May 21, 2009
Crutchfield Customer Review (What's this?)
Crutchfield Customer Review

The reviewer purchased this item from us, verified by the email address on the order.

 
This speaker sounds and looks great! Dialog and centrally located efx really sound wonderful and it blends well with my other RTi speakers. Do be aware, though that it has a LARGE cabinet - it's very deep. You may notice that it sits farther off the wall than your front speakers do. Make sure to spread your front speakers far enough away from it so it doesn't overpower them.

Crutchfield sent me an obviously used and damaged one; it was very dusty and the right cone was partially unscrewed. Shocked, I called them and they overnighted a brand new replacement. The replacement is fine.

All things considered, this is an excellent sounding speaker. You'll love it!
3 out of 3 people found this helpful
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5 out of 5

Incredible quality

Written By Andy, West Lafayette, Indiana on Sunday, January 31, 2010
Crutchfield Customer Review (What's this?)
Crutchfield Customer Review

The reviewer purchased this item from us, verified by the email address on the order.

 
Excellent sound quality, looks great too! I have this center speaker matched with Polk's RTiA3's up front and it's just an unbelievable sound field. I've wanted this type of home theater setup for years. It's a music lover and movie lover's dream come true.
2 out of 2 people found this helpful
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5 out of 5

Polk Audio CSi A4

Written By Misterkraft, Sammamish, WA on Sunday, February 06, 2011
Crutchfield Customer Review (What's this?)
Crutchfield Customer Review

The reviewer purchased this item from us, verified by the email address on the order.

 
I have a 12x14 bonus room dedicated to movie watching, this center is paired with the RTi A7 as fronts and in-wall RC85i as my surrounds. I don't have a lot to compare too, but this center is very clear and capable of producing some good mid-range bass too. I debated upgrading to the CSiA6 but I thought that would be a little overkill considering how good the CSiA4 is. Everything is powered by an Onkyo TX-NR807 which seems pretty solid so far. If I had a larger room I would consider getting the A6 and some Emotiva amps to push everything, but right now I couldn't enjoy it any louder and its still very clear. Very happy with this speaker for my purposes.
1 out of 1 people found this helpful
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5 out of 5

Excellent

Written By Bill, Mountain Top, PA on Saturday, April 19, 2008
Crutchfield Customer Review (What's this?)
Crutchfield Customer Review

The reviewer purchased this item from us, verified by the email address on the order.

 
I bought this as an upgrade to my Polk CSi20 center channel. My center channel was lacking. It didn't sound loud enough. There is a huge difference with this speaker. The clarity is excellent. It sounds great with DVDs and my PS3 games. It fits perfectly with my Polk RTi38 front speakers. I buy nothing but Polk because of their great quality. You can't go wrong with this one.
25 out of 31 people found this helpful
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5 out of 5

very clean voice

Written By Tacheng, Raleigh, NC on Thursday, August 21, 2008
Crutchfield Customer Review (What's this?)
Crutchfield Customer Review

The reviewer purchased this item from us, verified by the email address on the order.

 
I bought this CSI A4 center speaker under scratch and dent catagory (good discount from the list price) to replace my 11 year old CS250 (I dropped it and broke the speaker component due to the heavy magnet). This speaker is better than my old one and has a very clear voice spectrum. Other than the box, this speaker is in perfect condition.
3 out of 4 people found this helpful
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5 out of 5

Great center speaker

Written By Steve, Las Vegas, NV on Saturday, February 21, 2009
Crutchfield Customer Review (What's this?)
Crutchfield Customer Review

The reviewer purchased this item from us, verified by the email address on the order.

 
I use this center speaker in a home theater setup with other Polk speakers. This center speaker just fits in the drawer of the BDI Avion home theater cabinet. It has clear dialogue and blends seamlessly with my other Polk speakers.
1 out of 1 people found this helpful
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5 out of 5

Polk Audio CSi A4

Written By John G, Ulster Park,NY on Sunday, April 01, 2012
 
Purchased this Polk Audio center channel speaker when I upgraded my audio amp. and left the cathode ray tube world behind upgrading to a Sony 46'' LED Bravia TV. It blends in fairly well with my 10 year old Polk RT35i's. Probably would sound better yet with new Polk bookshelfs.
Pros:
Sound,fit and finish.
Cons:
None so far.
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5 out of 5

Csi a4

Written By Danielb, Palmer, Alaska on Friday, February 03, 2012
Crutchfield Customer Review (What's this?)
Crutchfield Customer Review

The reviewer purchased this item from us, verified by the email address on the order.

 
Originally got the A6 but it was to big to fit under my new tv. Crutchfield was great and took it back and set me up with the A4. It sounds incredible and fits perfectly.
Pros:
Sounds great, reasonable size.
Cons:
None
2 out of 2 people found this helpful
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5 out of 5

Amazing

Written By Dave S., Oberlin, OH on Monday, June 06, 2011
Crutchfield Customer Review (What's this?)
Crutchfield Customer Review

The reviewer purchased this item from us, verified by the email address on the order.

 
I recently replaced my failing Sony STR series receiver with the Denon AVR 1911. Once installed, the sound was really good. But my old bookshelf setup was lacking the thundering bass we were looking for. With that said, my wife let my pull the trigger on a set of RTi A5's and I found that this center was voice matched to those speakers. This is an amazing edition to the new set up! The sound is incredible! Not only that, even with the audyssey setting up the crossover for this speaker, the bass is still incredible! Crisp highs, tight/deep bass punches. The center is the heart of any surround sound system and this is the perfect foundation. I am so glad I took the time to call and talk to a customer service representative. He helped me select the right towers and complimenting center. Thank You Crutchfield for showing me that customer service is still alive somewhere!
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5 out of 5

Tower Speakers Optional

Written By DS, Henderson, NV on Thursday, January 26, 2012
Crutchfield Customer Review (What's this?)
Crutchfield Customer Review

The reviewer purchased this item from us, verified by the email address on the order.

 
I already did my research and chose the RTiA3s for the main speakers and FXiA4 surrounds in my new HT setup. Choosing the voice matched CSiA4 was a no brainer, it blends in perfectly. I want to write about the musical surprise of this speaker. I "settled" on the RTiA3's for my main speakers because I couldnt afford the larger A5s, or A7s with the center, surrounds and sub that are a must have for HT. I have a 7.1 amp so I figured I would start with the A3s in the front and move them to the back when I can afford the towers. This was the plan because my simple understanding of music is that it is usually recorded in 2 channel so it sounds best with 2 monster floor speakers right? I'm not so sure I will ever need those monster floor speakers - this CSiA4 adds 2, 5 1/4" woofers and a 1" tweeter to the already impressive sound of the RTiA3s and produces an overall better sound than 2 speaker stereo. turn on the FXIA4 surrounds and you get 2 more 5 1/4" woofers and 4 more 1" tweeters bringing to life a timbre matched 360 sound field supported by a DSWPRO 550wi SUB that IMHO would be hard to beat with just 2 speakers no matter how great they are. Dont get me wrong I'm not suggesting anyone buy this spreaker as a stand alone music option, I have over $1000 of sub woofer, surrounds and bookshelf speakers supporting this center channel...my primary goal was home theater with a plan to upgrade to tower speakers for music but I dont feel like I'm missing out...Tower speakers optional.
Pros:
Excellent sound and beautiful cabinet. Pefectly matches RTi / FXi line of speakers. Crutchfield's customer service is second to none! Order with confidence.
Cons:
More of a caution than a con. the CSiA4 is larger than many center channel speakers.
1 out of 2 people found this helpful
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1-10 of 13 items >>

Learn more about Center Channel Speakers

Learn more about Center Channel Speakers

Video: Speaker Placement for Great Sound

Video: Speaker Placement for Great Sound

Tara W., Video Guest
2/2/2009
based on 457 ratings (20 comments)
 

Learn about the basics of good speaker placement, so you can set up your speakers to deliver the best sound for your room.

 
Introduction to Home Theater Speakers

Introduction to Home Theater Speakers

Julie Govan
10/20/2010
based on 316 ratings (17 comments)
 

Ready for home theater surround sound? Find out which speakers you need and what role each speaker will play in your system.

 
Planning Your Home Theater Speaker System

Planning Your Home Theater Speaker System

Kristen Schaub
6/20/2011
based on 40 ratings
 

Putting together your own home theater system? In this article we'll go over a few things to consider when choosing your speakers, and help you plan your budget.

 
Speaker Placement for Home Theater

Speaker Placement for Home Theater

Julie Govan
4/11/2011
based on 1118 ratings (28 comments)
 

If you're in the process of choosing home theater speakers, knowing the basics of speaker placement can help you make the smartest choice for your room.

 
Home Theater in Real Life Rooms

Home Theater in Real Life Rooms

Amanda P.
12/4/2010
based on 114 ratings (10 comments)
 

Ideal speaker placement guidelines don't always jibe with reality. Learn how to get great sound from your system, even in oddly shaped rooms and open floor plans.

 

Accessories

Things you'll need

Bulk Speaker Wire
You'll need wire to connect your center channel speaker to your amp or receiver.Cut your speaker wire to the exact length you need with a spool of bulk speaker wire. No wire is included with this speaker.
AudioQuest X2 Speaker Cable
14-gauge bulk cable, connectors optional (50 ft., White)
$94.99
In Stock
 
 
AudioQuest G2 Speaker Cable
16-gauge bulk cable, connectors optional (50 ft., Gray)
$64.99
In Stock
 
 
Monster XP Navajo White Cable
Bulk cable, connectors optional (30 feet)
$32.95
In Stock
 
 
Monster XP®
Bulk cable with clear jacket, connectors optional (20 ft.)
$19.95
In Stock
 
 
Show more items

Accessories we recommend

Speaker Wire With Connectors
Connect your new center channel speaker simply and securely to your home theater receiver.
AudioQuest Type 4
Single center speaker cable with pre-attached banana connectors (10 feet)
$114.50
In Stock
 
 
Speaker Shelves
Mount your center channel speaker safely above the TV.
Center Stage Bracket CSB-1210-BLK
$59.99
In Stock
 
 
Speaker Stands
You'll want to position your center channel speaker for the best possible sound. Stands give you an attractive alternative.
Sanus NFC18
Single 18" center channel speaker stand (Black)

Also available in:
Open Box: $89.99
$99.99
In Stock
 
 
Wall-mounts
Add a bracket and wall-mount your center speaker.
Pinpoint AM15
Center channel speaker wall mount
$29.99
In Stock
 
 

Extras

Professional Installation
Have your new speakers installed by qualified professionals.
Show more items
 
Add selected to cart
 

For a more in-depth review and enhanced detailed information on the Polk Audio CSi A4, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_107CSIA4C/Polk-Audio-CSi-A4-Cherry.html ).

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After $30.00 Price Break
 

Bulk Speaker Wire

AudioQuest X2 Speaker Cable
14-gauge bulk cable, connectors optional (50 ft., White)
 
$94.99
In Stock
 
 

Speaker Wire With Connectors

AudioQuest Type 4
Single center speaker cable with pre-attached banana connectors (10 feet)
 
 
$114.50
In Stock
 
 

Speaker Shelves

Center Stage Bracket CSB-1210-BLK
$59.99
In Stock
 
 

Speaker Stands

Sanus NFC18
Single 18" center channel speaker stand (Black)

Also available in:
Open Box: $89.99
$99.99
In Stock
 
 

Wall-mounts

Pinpoint AM15
Center channel speaker wall mount
$29.99
In Stock
 
 
 
Add selected to cart
 
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Polk Audio CSi A4