Can't argue w/ (carefully chosen and especially bass-trap type) room treatments, but I also agree that the right Dac can make a bigger improvement than you might expect. For me, upgrading to a Schiit Gungnir Multibit (upgrading from a Stereophile A+ rated dac, by the way) made a surprising improvement in terms of overall listening enjoyment, and is arguably the new MVP in a system where some individual components are 5x its cost. No DSD on this one though. It is warm enough that I would suggest trying it first before adding tubes to the system.
Also upgrading a usb source from an (albeit older) mac mini to an Auralic Aries mini provided a surprising improvement and high ROI IMO.
Also upgrading a usb source from an (albeit older) mac mini to an Auralic Aries mini provided a surprising improvement and high ROI IMO.