I have been auditioning these Sophia Electric 9101 OPTs for a little more than a week and two words that constantly come to my mind are sweet and spacious. They do really have a "magical" tone inside a "timeless" space if you so want it to be. The sound is quite seductive with nice dynamics but never sounds harsh in any way. It's nice to have the tonal balance these OPTs have that takes away a little bit of the otherwise for some people too analytical and clinical sound of the 300B. I'm using a pair of 97db speakers and there is really a lot of pressure (dynamics) and body in the music, very detailed and well articulate for sure.

Thank you and I wish you luck with your company...

Sonny/Chris from Sweden