Unobtrusive design couples with great technology and great pricing to bring you Polk's compact CSi20 — a perfect center channel solution for budget-conscious buyers. With one 3/4" silk/polymer dome tweeter and one 5-1/4" Dynamic Balance® driver, the CSi20 offers up the distinct highs and mids needed for crisp, clear dialogue. An affordable and very nice center channel choice for the RTi28.


  • video-shielded
  • bass-reflex
  • frequency response 60-20,000 Hz (-3dB)
  • 8-ohm impedance
  • sensitivity 89 dB
  • handles up to 100 watts
  • black finish
  • 5-way binding post terminals
  • 15"W x 6-9/16"H x 7-9/16"D
  • warranty: 5 years

Priced each

Your home theater's most important speaker

The center channel speaker is the workhorse in a home theater system. It has to reproduce clear dialogue and special effects that keep your eyes and ears glued to the movie action. A high-quality center speaker is a great investment for any surround sound setup. Try to choose one that's as closely matched as possible to your front right and left speakers, so that as sound moves across the front stage, it stays seamlessly realistic.

Hands-on research

What's in the box?

Download owner's manual

  • 1 Black center channel loudspeaker with grille
  • 4 Self-adhesive rubber feet (if used they will add 0.42" to the unit's height)
  • Manual
  • Product registration and survey card
  • Online registration card

Product Research

Manual Correction


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.

Composite Woofer: The speaker uses a 5-1/4" composite Dynamic Balance woofer for clean midrange and deep, accurate bass. For a smoother response and improved durability, the woofer uses a rubber surround.

Silk/Polymer Tweeters: The improved Dynamic Balance silk/polymer tweeter provides clear, detailed highs.

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

5-Way Binding Posts: The 5-way binding posts will accept bare wire, pin connectors, spade connectors, banana plugs, and dual banana plugs.

Magnetically Shielded: Because the speaker is magnetically shielded, it can be safely placed directly on or near video sources without creating a distorted picture.

Recommended Center Channel Mode: Polk recommends using this speaker in the normal (small) center channel mode when used with either Dolby Pro Logic or Dolby Digital/DTS . The crossover is a 2nd order low-pass and high-pass filter at 3.6kHz.


Frequency Response: The overall frequency response is 55Hz-22kHz. The -3dB frequency response is 60Hz-20kHz.

Manual Correction

Speaker Impedance: The manual incorrectly lists the speaker's nominal impedance as 4 ohms. The impedance is 8 ohms.

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.

Be the first to review this product
Great Gear Giveaway

Submit a review and then enter to win a $350 rewards card

Review this product:

Thanks for taking the time to share your experiences about this product. Please be sure to focus your comments on the product itself. Read our Review Guidelines for more information.

Your email won't be visible. Please use the email address that is associated with your order.
(e.g., JohnD) Your review will be signed using the display name and location
(e.g., Charlottesville, VA)

Click on a star to rate the overall product on a scale of 1-5
1500 characters left
  Attach a YouTube Review
Crutchfield Video Review Guidelines
  • Only submit videos that you made or are authorized to use.
  • Do not submit videos that contain music, video or visuals that are copyrighted and belong to someone else.
  • Please see our Review Guidelines for more information.
500 characters left
500 characters left

Get everything you’ll need to enjoy your new Polk Audio CSi20

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.
Connect your new center channel speaker simply and securely to your home theater receiver.
You'll want to position your center channel speaker for the best possible sound. Stands give you an attractive alternative.
AudioQuest X2 Speaker Cable

AudioQuest X2 Speaker Cable

14-gauge cable, connectors optional (50 feet, White)

Item #: 703X250W


Add to Cart
AudioQuest G2 Speaker Cable

AudioQuest G2 Speaker Cable

16-gauge cable, connectors optional (50 feet, Gray)

Item #: 703G250G


Add to Cart
AudioQuest Type 4

AudioQuest Type 4

Single center speaker cable with pre-attached banana connectors (10 feet)

Item #: 703T410CTR


Add to Cart
Sanus NFC18

Sanus NFC18

Single 18" center channel speaker stand (Black)

Item #: 051NFC18B


Add to Cart