Most effective way to add room correction?

Couple of options:

• Roon (requires you to do your own measurements, see Room EQ Wizard forums)
• Replace your Node21 with a miniDSP SHD Studio.  It's a streamer with built-in Dirac Live
• Put a miniDSP between your DAC and integrated which probably sounds OK but I don't like it. :)

I have been looking at the SHD studio and bypassing the dac with the Schiit. I was just also turned on to the new flex.

Love the Studio. First streamer I got after Bluesound.

As s bonus it plays Pandora free. And with a headphone amp.

Streams best with BubbleUPnP (Qobuz & Tidal) but the installed custom Volumio works.

Matches well with an UltraCap 1.2.