Mhdt Havana, Havana Balanced or Stockholm v2 DACs. These are all Non-OS DACs with tube buffer outputs. Highly tunable via tubes, capacitors & ability to use either the stock PCM56P or the AD1865 chipsets. They can be voiced to sound euphonic but it's more a matter of sounding authentic, musically-convincing, having rich tone and being non-fatiguing to listen to.
Phil
Phil