Looking to add warmth

I'm looking for a solution to add warmth/richness or "emotion" to my rig. Currently the sound is what I would describe as dry/uninvolving, very accurate, but not pulling me in per say.

At the moment I'm using a HTPC running high bitdepth tracks via USB into a Wyred DAC2 being used as a pre to directly feed an Aragon 8008BB driving Philharmonic Audio 2's.

I would be spending money on room treatments, but my room is not very permitting. I live in a geodesic home and the living/listening room is very odd: there are few straight walls, its very open to the rest of the house, and there is a steel spiral staircase directly behind the listening position.

I've debated switching out the DAC to a PS Audio Perfectwave MkII w/bridge and foregoing USB altogether.

Or keeping the DAC2 and selling the 8008BB to switch to a warmer amp, or possibly go the tube route.

Or adding a USB converter of sorts to feed the AES/EBU input instead of the USB on the DAC2.

Tube buffer?

Adding a tube pre-amp? Or is adding another link in the chain only going to make matters worse?

Thanks in advance for any and all replies.