I'm listening 6CH disc on my computer with Front left and front right turned off. I can hear sounds that were buried in 2channel MP3 files. Vocal comes from the front and isntrumetns and chorus from rear speakers. It does feel like I'm in middle of the band.

I did another Dualdisc to DVD-A conversion. Process was painless and works wonder in TL. I noticed not all dual discs are 6channels! you have to read if it's "Enhanced Stereo" or "Surround Sound".