Treat the room acoustically. Look at GIK (though they have a long backlog at the moment) and other companies. There are plenty of threads on this. Searching GIK will take you to most of them.
What would you do?
So, I want to tweak the sound of my system (Hegel 160 integrated, Cambridge CXC transport, TAD tube DAC (pretty old), Joseph Audio RM25Mark2 XL). I want to increase soundstage and curb a slight tendency for high end harshness. I know that soundstage is mainly in the mastering of a CD. And I know that the room plays a big role but I can't make changes there. Just retired and "need" to give myself a present (up to about $3,000 new or used). Have been thinking about getting a new DAC ( Audio Mirror Tubador 111SE with Balanced output). But wonder if the money would be better spent elsewhere. Your input would be greatly appreciated. Thanks