I had the DAC3HGC with the AHB2 once so I know the way it sounds. I now have the LA4 preamp and the DAC3B.
I use this system in my 12 x 11 x 9 office. So that is a small space but I have my closet filled with my desk and 6 monitors hooked up to 1 computer. Sounds like a recipe for bad sound.
However, I made the room sound great by calling GIK Accoustics and they helped me setup acoustic panels to tame the room. That is all I use now with my KEF LS50 Meta + KC62 sub. However, when I had a bigger speaker in the small space, a Thiel CS3.7 I also used DSP via convolution filters running on ROON. I do not need any audio hardware to run this DSP. I used a cheap computer running ROON in a room far away from the office.
If you are getting fatigue from the sound then look at your room. Acoustic panels could be all you need, but they are intrusive into the space. I did not care in my office. If the panels cannot be used in your circumstances or they are not enough then DSP will solve the rest.
Using the panels or DSP is always better than getting fatigue in a room that is not playing nice.
Something interesting on room accoustics
While I’m at it, I might as well include the latest measurements of my room / system. As always, these are collected using Audiolense and the help of @mitchco from Accurate Sound, who designs my 65,000 tap, frequency and time corrected, convolution filters. This isn’t your father’s DSP, to say the least.
Mitch also did the DSP for my office. That dude is a star at this and can do anyones room remotely.