Is this just what I imagine, but the volume of the sound seems to have been louder in later concerts with Rory. That is why I have difficulties to appreciate early recordings like Taste and Montreaux 1975. The sound is too thin.
It is difficult to recreate if you don't have an excellent home-equipment, but I am a fan of sound that you really feel physically, a distinct base and infrasounds (which elephants can perceive)
As he seems to have used mostly the same amps I suppose it was achieved with better PA stuff