Here is something I've been thinking about. Can the perception of warmth be less of a matter of frequency bending and more of the rise and decay of the electronic's.
I think a lot of equipment, especially SS stuff, is so fast, especially in damping that a lot of the natural decaying sounds are cut off prematurely and this contributes to a 'cold clinical sound' vs a tube unit which has slightly slower rise and decay time. This would also go to the issue some raise of 'resolution', 'what is too much'. Again, nothing to do with frequency so much as the naturalness of decay.
Just food for thought........
I think a lot of equipment, especially SS stuff, is so fast, especially in damping that a lot of the natural decaying sounds are cut off prematurely and this contributes to a 'cold clinical sound' vs a tube unit which has slightly slower rise and decay time. This would also go to the issue some raise of 'resolution', 'what is too much'. Again, nothing to do with frequency so much as the naturalness of decay.
Just food for thought........