Time to upgrade DACs

In a room like yours, a side firing woofer and the right tweeter can do some extraordinary things.  The Scansonic MB-3.5B could be a pretty awesome speaker for you.  I first listened to them in a room that is about 15' x 25' with 15' ceilings. 

Placement is critical.  You would want to have them 8-9' apart and a solid 2' of space behind them.  That will leave 3-3.5' to the side of either speaker and your walls are treated.  

The scansonics have "raidho DNA" and regardless of what you think of Raidho's pricing, the tweeter they put in these speakers is unreal.  If you are looking for imaging and an extraordinary, three dimensional soundstage...and you have the right room, nothing beats Scansonic and Raidho.

The tough part for most people is the right room.   When you get the placement right, when the soundstage comes together it is immersive with the best imaging I have heard short of my own speakers.  

PM me if you are interested.  I am an authorized scansonic dealer and would even take your speakers on trade to make it super easy for you to upgrade.  Would need to talk condition but a very healthy trade allowance (~$1500) could make it an interesting option for you.  

I could also work with you on a Chord Qutest as a potential solution for your DAC.  Chord's to me have a more natural sound than traditional chip DACs.   

Thanks for the feedback and advice. Sounds like the consensus is to upgrade the speakers and put off the DAC upgrade for now. That said I should have about $5,000 or so to invest in speakers. My YBA Integre DT (2) are 50-watts per channel class A integrated which I love and plan to keep. (caps are redone, etc). So the new speakers will have to fairly efficient. 
Suggestions so far are:  Scansonic 3.5B,  LSA 20 Statement,  Nola KO also intrigued by the Tekton DEsign Moabs.

Please weigh-in on these and others and thanks once again for your ideas and experience...much appreciated. 

The Scansonics have an 89dB SPL.  At 8' from the speakers, peak output would be ~104dB, at 10' 102dB.  That is plenty for music for normal to reference listening.  A little light for home theater.  

In the price range you’re looking at for speakers, one usually invests in beefier amplification. Keeping the YBA and swapping the speakers is going to severely limit your speaker options. That isn’t to say you can’t find a match that suits your tastes, but if you’re spending $3k+ on speakers I’d typically expect complementary amplification that can deliver at least 150w - 200w.

I’m still of the opinion that adding tubes to the signal chain may satisfy your requirements. To be honest, I don’t think you’re looking for neutral sound. You want exactly what tubes deliver, large images and a warm/full presentation. Kenrad VT231/6SN7's will deliver exactly what you're looking for.

https://forum.audiogon.com/discussions/black-glass-kenrad-6sn7s-take-the-cake

Edit: Not sure where you live but I think it’s worth your while to hit up the local hifi shops and take your DAC with you. It might help you identify what components in your current setup aren’t fitting your desired sound profile.

One thing I am curious about....your original question around DACs.  Do you need a headphone amp?  Or are you just looking for a new DAC?  If you just need a DAC I might have an idea.