Honestly I am not getting any noise floor with PWD connected, did try with Schiit Bifrost (unbalanced) for a brief period I can hear noise with it, but with PWD it is dead salient. Vol level I am using is also not high should be around 75 db, with this song if exists noise floor should be evident, I am only enjoying those piano notes
Mine has noise floor without a source connected! Anyway, I'm glad you don't get any noise floor. Enjoy the amp as it is truly wonderful.