but the sense of spaciousness, air,This may sound a little strange but when I was auditioning speaker cables in my home I found the Nordost Frey's gave me just that. In fact my first impression with the Nordost was they seemed to be thin and lean sounding. But the more I listened to them I picked up air between the instruments and vocals. After hearing that I bought them.
I know that doesn't help you since you have 2 sources and you are looking to get get similar sounds with everything else being the same. I do have a Meridian G08 and just thought I'd mention what I heard in my stytem.