Center Channel

This product is a vintage Polk model and is not available for sale, but it may still be available in some stores as a closeout or used product. The following text is taken from the original sales brochure for this product and does not reflect current availability. If you happen to have any question or concerns about this product, or any other Polk Audio product, feel free to contact our Customer Service Department at 1-800-377-7655 Monday - Friday, 9am - 5:30pm EST


High Performance Center Channel Speaker

Available Finishes:
Additional Images

Center Speakers That Give Everyone A Front Row Seat

When you've got high performance main/front speakers in your home theater/multi-channel music system, you need a high performance Center Channel Speaker to carry the day. The Center Channel Speaker is more than just a dialogue speaker; it has to be, since it delivers over 50% of the information in multi-channel movie and music formats. The CSi40 has features that make it the high performance match to your RTi Series main/front speakers, anchoring the action or instruments to your screen.

The CSi40 features:

  • Reformulated poly-composite Dynamic Balance drivers with butyl rubber surrounds for durability and smooth wide range response.
  • 1" silk/polymer composite dome tweeters for clear, detailed highs.
  • Power Port bass venting for low distortion bass response, extending the range of Center Channel Speaker performance.
  • Identical RTi components for a more lifelike, seamless timbre-matched surround sound environment.
  • Magnetic shielding for safe placement directly on or near video sources.
    Dual (bi-ampable) gold-plated 5-way binding post inputs for the most secure connections and the most versatile wiring applications.

Driver Complement

Diameter1" (2.54cm) 
TypeDynamic Balance® silk/polymer composite dome, shielded 
Mid / Woofer
Diameter6 1/2" (16.51cm) 
TypeDynamic Balance® drivers, shielded 


Total Frequency Response40Hz-27kHz 
Upper -3dB Limit26 kHz
Lower -3dB Limit50 Hz
Nominal Impedance8 ohms
Efficiency91 dB
Recommended Amplifier Power10-250 watts per channel
Inputs5-way binding posts 

Amplifier Specs

Amplifier Type


Cabinet Dimensions
Height7 1/2" (19.05cm) 
Width22 5/8" (57.47cm) 
Depth12 1/2" (31.75cm) 
Product Weight (each)24.00 pounds


Unit of Measureeach 
Total Shipping Weight26.00 pounds


Speaker Warranty5 years parts and labor, limited 

Specifications, dimensions and features subject to change without notice. For more information call us at 1-800-377-7655 (USA and Canada). Outside of North America call +1 (410) 358-3600.

CSi40 Media

CSi40 Literature

Want to know more? Want to dig just a little deeper to learn about this product? Here's a list of source material that will give more detail, other perspectives, and answer questions you may have.

CSi40 Accessories