Looking for nearfield passive speakers that are warm and rich

@soix  Either.

Harbeth P3ESR seems like a popular warm option.

The Folia Jubilee is a good choice as would be the Bliss Jubilee if you have the room. I own both the Bliss and Abscisse Jubilee models. Have owned six JMR models total over the last twenty years. I also own a pair of Harbeth C7's which would be the model line equivalent of the Bliss Jubilee's at almost double the price.  To me it is not a contest as to which is the better speaker.  

@smodtactical

I would recommend Tannoy Legacy Eaton or Cheviot if you can stretch to them.

Also consider vintage Tannoy with Monitor Gold 10” / 12” or HPD  315a drivers.

Viz

Not sure of what size people consider desktop but I think the Chartwell LS6 are very nice for near field. Check out the size before buying. 

Here’s an option. Keep your speakers. Look into trying 6N6P tubes in your ARC preamp. The stock 6H30 tubes can be glassy and bright.