The KEF Reference 1, as well as its bigger siblings, have been objectively measured to a very high degree of accuracy and are natively about as neutral a speaker as you can find. The Reference family of speakers (excluding the 4c center channel, which has a bit more deviation with some rolled-off treble) is within 2dB of the reference level frequency. If you want a warmer tone, that's fine, and I'll second the Legacy Audio products as a great fit there, but if they are coming across as bright, that's far more likely the effect of your room and/or your electronics imparting that brightness. Before investing in new speakers, look at your space and see if you need to adjust your speakers' toe-in or put in some treatments to knock down the highs a bit.
speaker upgrade fever
I'm considering a speaker upgrade to compliment my Aesthetix Mimas integrated. Currently, I've got KEF Ref 1 monitors paired with (2) REL S/3 subs. Must stay away from bright, analytical and clinical presentation. Room size 12'x19'. Music is jazz, acoustic Americana, Chamber, symphonic etc.
Looking at the ProAc K1, Triangle Duetto and the DeVore o/baby. Also, a huge departure, Vandersteen Treo CT, floor standers. I understand Vandersteen pairs well with the Mimas.
Always open to suggestions, happy to buy quality used and demo.
Budget, ~$8-$11K