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.

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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.

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