This review by Absolute Sound of the R300 mentions:
- "The sonic signature of the R-300 can be summarized in a few words—precision, pitch, forward, and focused. Its tonal balance conveys a smooth, slightly gung-ho midrange bias with little in the way of significant energy droops or peaks."
- "Bass reproduction is rock-solid into the midbass."
- " The three-way configuration gives the speaker a warmer and more dynamic midrange balance, and that warmth and dynamism extend into the lower mids and upper bass, where, to my ear, this little bit of enrichment makes the R-300 sound like it has slightly more low-frequency extension than it actually possesses."
- "Midrange dynamics are especially lively."
- "With solo piano the R-300 consistently revealed the nuance and sensitivity of the player’s touch on the keys. It was equally informative about other low-level cues, and about the fine gradations of dynamics that allow musicianship to envelope and immerse."
- "The R-300 creates a more laid-back sound."
- "Image focus is wonderfully precise."
- "The R-300 conveys tonal and timbral colors that are exceptional in this price range.."
http://www.theabsolutesound.com/articles/kef-r-300-loudspeaker/