the music you play #1
room acoustics positioning and treatment DYI mostly. transformational
speaker cables significant
speaker stands, points, proper coupling and isolation (I use both right now) significant to transformational
Green pen the edges of your CD's center and outer edges (very significant to transformational) $3.00
Acoustical damping components (marginal to significant.
Arcicci Levitation rack, Billy Baggs rack significant.
Acoustical damping front wall between speaker dense tapestry Significant
acoustically damping components DYI marginal but noticable
Closing eyes and darken the room significant
then going deep into music nirvana HUGE!
a good contact cleaner.
and probably (not yet fully tested) tweeter diffraction (felt etc) , rings etc
AND HUGE IS PROPERLY WARMED UP GEAR!!! (both tube and SS!!)
and I am voting with Synergistic Research or this; Sun spots take you sound down a whole bunch of notches,
my experience, when I lived in Seattle, is that in damp cold fog your system will sound dead and flat.