I compared my current line-up of Klipsch Synergy KSC-C1, KSB 2.1, KSB1.1, and a Boston Acoustic CR400 verse the Klipsch Reference RC-25, and RB-25 while the sub and surrounds remained the same. TWO receivers where used in this test. A Yamaha RX-V730 (considered Bright by many of you) and a Harmon Kardon AV235 (considered warm). I set-up both speaker arrangements in similar fashion and played various TV shows and sports programs (Including watching my Pats win!) through each speaker set-up and receiver set-up. I then played the following DVDs on the speakers and receivers; Return of The King (DTS), The Mummy Returns (DD), and Lost in Translation (DTS). Compared to the Synergy 2.1 speakers, the RB-25 speakers produce a noticeable deeper bass and the RC-25 is slightly deeper then its Synergy counter part (you need to really listen for the bass). Both the RC and RB displayed a sharper audio output then their Synergy counterparts (some call it more Dynamic) but they where not picking up audio detail that the Synergy speakers missed. The big difference between the two speakers; the reference speakers are BRIGHT. I mean headache causing BRIGHT. While listening to them, I could not wait until the movie or program ended so I could turn them off! Once I replaced them with the Synergy speakers, my headaches would slowly go away. It did not make any difference if I had the reference hooked up to the Yamaha or HK, they where still BRIGHT. One thing I did notice on the HK, setting the receiver to DTS NEO rather then Dolby Prologic II did help tone down the speakers a bit on TV shows.
My older Synergy speakers are no longer sold so I cant compare them to the current Synergy speakers but my advice if you are on the fence between Synergy and Reference speakers, save your money and invest in a better TV. You will be glad you did.