FWIW, I use mine with a MF M3i but the only other amp I've listened to them on is a NAD. I'd really like to hear the Kefs with a tube amplifier. Compared to the Harbeth P3ESR's which I also have, the Kefs seem to have less dimensionality than the Harbeths and good tube amplification should improve this.
That said, if you didn't directly compare the two speakers ina a system and room that you were familiar with, you probably wouldn't even notice it.
That said, if you didn't directly compare the two speakers ina a system and room that you were familiar with, you probably wouldn't even notice it.