Steve over at Decware has a modded DA3000 (ZDSD). He had Jensen make special output transformers that are internally mounted. They are coupled to the balanced output stage and convert to unbalanced for output. This allows for the same voltage output as balanced with a pot to adjust the out voltage. There are some positive reviews of the mod on his forum.
http://www.decware.com/newsite/ZDSD.html
http://www.decware.com/newsite/ZDSD.html