I went to listen to a variety of Devialet stuff this week at the Devialet showroom in Paris. Got excellent, courteous service from the young salesman, who is a musician and sound engineer. He had prepared the playlist I has forwarded ahead of time and spared me the OTT sales pitch and just let me listen, answering any questions I had.
First listened to/compared a D200 + Atohm GT1 combination and a pair of Phantom Silvers. This was in their upstairs room, which is not a great room acoustically (massive windows, haphazard speaker positioning, no sound treatments in evidence). We listened to a mix of Beethoven piano sonatas, Bill Evans, Eels (Nlovocaine & Susan's House, French baroque and Bartok orchestral stuff. Sources were Qobuz or Tidal, CD std.
The music sounded entertaining but slightly boxed in with the Phantoms. The enthusiastic yet precise bass was the most impressive thing, especially vs. the size of Phantoms. The mid range is OK, good for the price but not the last word in refinement: slightly harsh piano and vocals were not 100% clear. Complex music could get a bit muddled. On the whole I thought the whole thing was better than a Linn Magic DSM + Majik 109 combo I listened to recently, but not massively so. They are very good for an all-in-one box but not giant slayers. There was more air with the D200/Atohm and the feeling of music coming out of a box disappeared, but the piano was still slightly harsh. Paradoxically and despite their shortcomings in the upper mid range and treble I thought the music flowed better with the Phantoms than with the Atohm. Imaging-soundstage was mediocre in both cases. I really did not like those Atohms, so I really don't know what the D200 can really do.
Listened later to a Devialet 800 with B&W 804 Diamonds in another bigger room downstairs (that was not ideal either). Now that was very, very nice. The music flowed without a trace of harshness in the piano. Realistic soundstage, the speakers had vanished, vocals were more intelligible than on the 200 + Atohm upstairs. It felt as good as my main (valve) system in its strong points, and better in terms of the total absence of hiss or any sort of background noise and the effortless feeling of power. Paradoxically the bass department felt less forward and obvious than with the D200/Atohm but more integrated and realistic. This combination completely buried the D200-Atohm anyway.
Phantom Silver and Phantom White: did only a brief 2' comparison, mono only while standing in the shop. The Silvers sounded rather better, but did not have time to dig any deeper.
Conclusion: the Phantoms are a great all-in-one combination, but don't come anywhere near the D200-400-800 family running a pair of good speakers. I may end up buying a pair of Phantoms for the little flat because of the compact size, ease of use and decent sound, but will not be getting rid of the main system just yet.