I don't know, but will make sure before I make that mistake again I think a friend sent his in for an update and Dan was able to add a zero point on the dials. I have not seen it with my own eyes/ears.
IMHO you should listen to the combo - I did not like the power amplifier until I listened to it with the matching preamplifier. But if I was not happy with my setup and had the funds it would be hard to resist - and remember I am a tube man!
I have a Devialet 200 that I use with a pair of Magico S1s. I found the SAM feature improved the quantity and quality of the bass in the S1s. I suspect SAM's improvements will be more noticeable in smaller 2 way speakers than multi-driver full range speakers. The list of SAM ready speakers appears to skewed towards speakers with restricted dynamic range at the moment.
In my case I replaced a Simaudio integrated amp, a Simaudio phono preamp, and an Ayre QB9 usb DAC with the Devialet. The cost of the separates, less interconnects, was about the same as the Devialet. The performance of Devialet was a significant improvement over the old setup. The fact that it does it all in one attractive package is icing on the cake.
I look forward to your review of the 400. I hope you use it with the S1s and compare its performance to the 200. I think the S1s will benefit from the extra power, but my wallet hopes not. Devialet is offering 15% off the slave unit until the end of September so I hope your review is out before then.