Spot the difference.
As you can see, I recently updated from the superb KT120's to the KT150's in my copper amp and I have to say it's a superb upgrade.
A lot has been said about the KT150's. From the off the midrange is much more lucid, slightly less shouty in comparison with the KT120's with an increase in air around instruments and more top end definition. On the lower registers the sound is much more organic sounding with much more texture.
Very happy with them so far and they still have plenty of loosening up to do... Job's a good un.