Last time I checked the Zana Deux does not include a source.
It's all about perception, to me, the zana duex amp is less "flat" than the isabellina combo and has a slightly more warmer tone.
If you go back and read the sentiments for the sa5000 since its conception, it becomes quite evident a wide variety of opinions is offered.
Wasn't suggesting the ZDSE included a source. "Amp/source" is not necessarily the same as "amp + source." It could mean either-or.
Also to my ears the ZDSE is in no way warmer than the Isabellina, FWIW.