I bought a $12 Beldin power cord that drastically improved my system. (Beldfoil shielded, 14x3 gauge, 1800W capacity, SJT cord.) I immediately also heard greater detail in the soundstage with the most apparent improvement exhibited in the midrange.

If you don't believe me, please check out my post of August 08, 2003 01:20 AM in this thread:

http://ubb.outlawaudio.com/ubb/Forum15/HTML/000908-2.html