Devialet curiously sounded better than the Rowland, which surprised me.
That doesn’t surprise me at all, if the Rowland was the $10k Continuum S2.
As in that they just used a Pascal "tweaked?" Cheap Chinese Class-D modules made for sub-woofer amps.
http://www.theaudiobeat.com/equipment/pics/jeff_rowland_continuum_2_large_inside.jpg
https://s25.postimg.cc/g9j21ldv3/20170819_180541.jpg
And here is the $100 Chinese Sanway subwoofer amp https://imgbb.com/kBHf1S4
Cheers George