the location of your listening position and the speakers is priority 1. Make sure everything has room to breath, and begin with an equilateral triangle, then experiment with increasing/decreasing distance between speakers, and toe-in of speakers.
In my experience, getting the speakers and the listening position correct -- which may mean making your room look odd to non-music-lovers! -- makes the hugest difference. Night and day, imo.
good luck!
/ optimally proportioned triangles are our friends
Edits: 10/18/10
This post is made possible by the generous
support of people like you and our sponsors:
