i heard 568.2mm with 598mm in my friends' system.

triefield sounded much better than stereo.
but this is because stereo was just very far from satisfactory.
i can;t say that triefiled was good enough.

obviously i can't judge by one audition on not familiar system - but you, guys, have you ever compared yor 56x against good pure stereo preamps?

My system:
http://cgi.audioasylum.com/systems/4657.html