I have a rti line up in my basement. Rti12s for L and R csiA6 for center and rti6s for rears. I bought the rti12s this year and looked for a center that was timber matched and asked Polk support. Two people said the rtia series are timber matched so I bought the csia6 from futureshop. It's hard to hear with movies if the center isn't blending well,with your syste but music I noticed in dsp mode the csi a6 sounds like its warmer than the rti12s with high vocal songs. Im finding the 12s to be soo neutral and grand that I love them! But then I add in the center channel with vocals and I hear a warmer sound! For example, listening to Susan Bowles album I'll focus in on the center channel and it Will sound fine but then I. Move to the left and right speaker and I can hear them a little more pulled back like not as high in the notes. So what I'm asking is these speakers are timber matched then right? Like this is how a center channel would mix in a system? The older csi 5 wouldn't be different?