Thanks for that explanation, M. I've heard and experienced 'warmth in music reproduction' but never knew the why. Perhaps somewhat related is: 'Binaural Reception'. http://www.arrl.org/files/file/History/History%20of%20QST%20Volume%201%20-%20Technology/QS03-99-Campbell.pdf http://theradioboard.com/rb/viewtopic.php?f=8&t=3867 Richard