Richard I have not heard the S300 but own the Ref1000's.
Mr_sukebe I don't fully understand you comments made because they seem to be contradictory, can you explain further.
Richard I own the Ref1000's and what you mentioned regarding the vocals, singer stepped back from the mic compared to other amps, I am not having any of these issues. I am very impressed with what these amps are doing.
What is the rest of your system? and secondly what are the other amps you are referring to?