Mytek Liberty DAC for $1K adds a noticeably sharper focus to the analog out from Node2i in my system...not jaw dropping to me, but it also preserves the MQA advantage. Since the Mytek has a linear PS and Node an SMPS, that may account for my improvement as much as the DAC chip. You can upgrade the Node itself to LPS, for example:
https://pd-cf.com/product/bluesound-node-2-2i-upgrade-kit-low-noise-psu-interface-smpsu/
That;s a budget friendly place to start.
https://pd-cf.com/product/bluesound-node-2-2i-upgrade-kit-low-noise-psu-interface-smpsu/
That;s a budget friendly place to start.