It does not sound like a DAC issue, to me. Those are very good DACs you have.
Have you decoupled your speakers from the floor? That would make a big difference in SQ, like having new speakers. Try, also, moving your speakers away from the rear wall, a little at a time.
Good Luck.
Have you decoupled your speakers from the floor? That would make a big difference in SQ, like having new speakers. Try, also, moving your speakers away from the rear wall, a little at a time.
Good Luck.