After a bit of research I finally tracked down a regionfree
hack for the Sansui DV-X2600 player.

Naturally, I'd like to share it !

1. Power On
2. Open Tray
3. Press 2,9,1,8
4. ENTER

This displays the 2-page hidden menu. Change Region to '13' to
make the player multizone.

No Macrovision disable on the current firmware revison v1.0.

I got this straight from their service guy, and noticed it
is the same key-sequence as for the MiCo Electronics Classica 20.

The DV-X2600 is sold in the US as the Curtis Mathes CMD5000,
so this should work on that player as well.

Enjoy!