Summary: I wanted to upgrade from the CSI4 but I didn't want to spend all that money for CSI6, at 225.00 can't beat the price and it is a beautiful, sound matched speaker to my other RTI speakers, (A3 fronts/A1 rears) excellent center channel, sounds great and purchased from Polk, so it's under warranty for two years.
Summary: I like most upper end Polk speakers and I do really like this one. It opens up when you supply clean power to it. I use an Adcom briged amp at 200 watts mono @ .09 THD. This speakers needs power to really open it up, my Onkyo 115 watt output did NOT do the job.
Summary: I purchased this speaker to replace an old Polk CS200 center speaker that had blown a midrange. Checked first with Polk to see which would go best with my 4 older, but still excellent Monitor 7Cs and 5JRs, and the CSi5 was the recommendation. (It is being discontinued and now being replaced by the CS6i, which is the current recommendation.) Soundwise, this is a perfect match!
Excerpt: The Polk csi5 center speaker is very well built, the back kickstand let you adjust the pitch of the speaker, you can align the tweater with you ears level perfectly. The two 6.5 inches driver can handle 200 watts of power, they sound great with just enough bass, but this speaker perform really better when matched with the rti6, rti8, rti10 or rti12 front speaker, they all have the same 6.5 inches driver and the same tweater for a perfect timbre matching.
Pros: great bass response ajustable kickstand reversible for placement under ear level bi-ampable
Excerpt: I have recently purchased the Polk Audio CSi5 center channel speaker and many other matching Polk products, and I can honestly say that it does everything right. The lifelike sound projection and clarity are top notch. The speaker can handle plenty of power with the greatest of ease, making it ideal for the home theater enthusiast. Mine is currently hooked to an Onkyo 898 receiver that was intended for serious home theater.
Pros: Crisp clear sound Kickstand,and Bi-Wireable Power handling 200 watts