What the Best Dac have you heard or owned. How could you tell it was that good.

Might be a bit deeper. A tube DAC took me a step.

Do a search for AG member, jjss49. Look at his thread "dacs that I have had in my system - a listing".

I am unable to attach the link at this time 

Lampizator Baltic V4 is the best DAC I've had in my system for most vocal or acoustic music, for electronica/ambient and often (not always) large scale symphonic music, the DAC in the Lumin P1 is my preference. Among budget DACs I really like the Weiss DAC204, it's got me thinking the Weiss Helios might really be end game for me.

When I went to upgrade my dac I listened and demoed in my system as much as I could. After narrowing it down to the MSB Reference with separate power supply and the Nagra Tube Dac with separate power supply I ended up purchasing the Nagra. If your budget allows, I highly recommend a unit with a separate power supply.  You will notice a much cleaner sound with more quiet background in my opinion. Love them both but felt like the Nagra did a much better job of making the music uncolored and sounding like the actual instruments are in my room.