The R300 does measure decently well, but the article linked below is very extensive test of the R300 coax driver.
http://medleysmusings.com/kef-r300-midrange-drive-unit-testing/
In the testing, it was noted the speaker demonstrating a flare at 5-6khz, which would certainly correlate with what has mentioned. The LS50 is also a very extended design and does display an elevated treble response. But if comparing the LS50 and R300, the LS50 will no doubt sound brighter due to its response curve and the lack of balance in bass.
Some other reviews also noted the R300 integration not being quite whole between the drive units, and in specific the bass to mids. Haven't heard the Adante, but the very first measurements show a bit of flare from 8-12khz. Enough that it will likely be a bit airy sounding on good recordings but hot recordings won't be so enamored.
You won't get consensus on treble response in speakers as we all have notably differing hearing abilities, especially as we age. I experience a little above average relative to age, others I know are at or below.
http://medleysmusings.com/kef-r300-midrange-drive-unit-testing/
In the testing, it was noted the speaker demonstrating a flare at 5-6khz, which would certainly correlate with what has mentioned. The LS50 is also a very extended design and does display an elevated treble response. But if comparing the LS50 and R300, the LS50 will no doubt sound brighter due to its response curve and the lack of balance in bass.
Some other reviews also noted the R300 integration not being quite whole between the drive units, and in specific the bass to mids. Haven't heard the Adante, but the very first measurements show a bit of flare from 8-12khz. Enough that it will likely be a bit airy sounding on good recordings but hot recordings won't be so enamored.
You won't get consensus on treble response in speakers as we all have notably differing hearing abilities, especially as we age. I experience a little above average relative to age, others I know are at or below.