JefDC

I think the 440c and the 450c with 4 woofers do have an advantage over the Centers with 2 woofers. In the 440c and 450c two woofers are used up to 500Hz and 2 other woofers are used for 500Hz till 1500Hz, which reduces Frequency Modulation distortion compared to the 250c which uses two woofers that handle lowest frequency up to 1800Hz.

Tweeter was Klipsch 160744 K-137 apparantly discontinued and replaced by : klipsch k-138-160748 (use google to find out more).

I have a R-26-FA and a RP-160M (bookshelf speaker) - The RP is far superior to the R-26. And convinced that the same quality difference exist between the R-28F and the RP-280F.

Differences in 'timbre' between speakers can be heard easily by playing a 'noise' sound - most home theater amplifiers have a noise generator to set /check the speaker levels which can be used for this 'test. I think timbre matching the Center to the L/R is over-rated.

Regarding the numbering - it seems to me this is consistent with the older numbering: RF82 : Reference Floorstander - 8 inch - 2 woofers RB61 : Reference Bookshelf - 6 inch - 1 woofer RP504c : Reference Premiere - 5 inch - 4 woofers - Center jef

I have a 440c a in room of 12x24x9 and very satisfied with it. jef

Check : http://support.klipschgroupinc.com/kb/faq.php?id=79 Link to RP-160M at the bottom of the page.

You can hear the difference between Cerametalic and IMG clearly. I have modified my R-26FA's from IMG to Cerametallic after hearing the difference with my R-160M's.