I'm guessing Richer Sounds
I agree though that the DACMagic plus could be a bit - though not *entirely* - superfluous bearing in mind the quality of dacs in the other components. Whilst they're a bit better in the DM+, i'm not convinced it'd be 350 quid better.
Easy to assess though, by having the sources plugged into both the amp and the DM+ and flip between the original source and the DM+-enhanced one. If you can tell a difference then you can judge whether it's worth what you paid for it. If not, I'd be urging RS to take it back (though they'd be under no obligation to do so, of course).
Of course, you may actually have a use for the DM+ by plugging a laptop or Airport Express into it for streaming purposes; reading between the lines I suspect not.
FanTAStic speakers btw...:-D