DAC + Preamp + Room Correction, NAD C658 / MiniDSP SHD / ?

Two thumbs up, way up, for the minidsp SHD. In the past I have not been satisfied with the integration of my 2 open baffle Rythmik subwoofers with my German Physiks Carbon speakers. The SHD performs this function flawlessly. In addition the Dirac room correction is amazing. The unit is dead quiet with absolutely no speaker hiss.

while I am certain that the miniDSP SHD is a fine bit of kit and sounds great... it uses AKM 4490 chips while most current HiRez boxes are at 4497 chip line. I do not see that it will decode DSD natively. No MQA.
If you just want PCM and Dirac it will be outstanding. This is one box that I am very interested in hearing.

@canibefrank: In your consideration of MQA, I suggest you review the history of another lossy, proprietary codec that once was the darling of the audio magazines:  HDCD.  Today, it's lost in the dustbin of audio history; yet when new, purple prose came from the audio writers (in particular, one Robert Harley) of a volume and pitch not seen again until MQA came on the scene.

Like everyone, you will (and of course should) make up your own mind. It never hurts to revisit audio history.