Nrchy,
The Krell FPB300 and 600 (on now 400 and 700) will also blow away the KSA300S.
Having said that, I own and use the FPB300 for the top end of an actively crossed over speakers with the KSA300S for the most realistic, powerful low end imaginable.
I attend the symphony regularly, so my opinions are based on how systems sound in reference to live, unamplified concert music.
Richard