Which DACs are known to be sweet/rich/relaxed?

I think your problem is the Focals. In the UK they are known to have a very bright signature sound. When Focal and Naim combined it was unfortunately not a good marriage from a Hi-Fi view - Naim has a very forward presentation and mixed with the Focal it makes for uncomfortable listening for many. If the Gryphon has this very detailed Naim sound then the amp-speaker combo you have will be the cause of the harsh top end.

I’ve had these issues before, harsh sounding systems, and I really think that changing the DAC will not really help, and changing the streamer less so. 

+1 duckworp,

This thread makes me believe (more), that audiophiles are more interested in throwing money and stuff on the wall and hoping it will stick than delving into the source of their problems so that they can intelligently fix them.

Why would you be so sure about a tube dac when you have a nucleus and solid state amps? Why go tube here? I don’t understand the logic there at all. Yes a great streamer is king. My Wadax Atlantis streamer changed the whole sound in my system. A great streamer is first before considering a great dac.

How many times does this type of post have to occur with pretty much the same responses every time?