It's not the cables, it's the placement of the speakers within the room. Get that right before messing around with cables and components. See:
http://forum.audiogon.com/cgi-bin/frr.pl?rspkr&1197744079&read&3&4&
http://forum.audiogon.com/cgi-bin/frr.pl?rspkr&1197744079&read&3&4&