NO listening sessions posible , bookshelf for a Raven Nighthawk

My room is at least 1m bigger each way than yours. Recently we had some small speakers only 87dB sensitivity and the Raven Blackhawk drove them good and loud. 

So no worries about power. Also would not worry about warm speakers being too much of a good thing. Raven is not "warm" other than compared to sterile analytical solid state. My Blackhawk is real nice and neutral, with both great bass and excellent top end. I would call it liquid maybe but not warm. The Nighthawk is the same amp only without the bespoke in-house Raven caps, and a few other little things. But basically the same amp. What you will probably find then is it sounds great when turned on and then after playing music an hour or two gets to sounding downright magical. 

So my only speaker recommendation would be to steer towards speakers that share this same strength. Emotion and inner detail uber alles.

A newly formed tube lover, eh? Welcome to the party. Your preferences
mirror my own. I will assume an 8' ceiling? So not a small space really.

There are so many choices of great 2-way speakers for an office use 
that can hardly get a dog. Some of the brands mentioned above are not
in line with your listening preference. I own older Tannoys for the main system and am also perfecting my office system.

My current speaker front runners are:
(not in order)

Spendor 3/1 $1.5+ or - used. Or the old BC1s. Ugly and bigger but
sound is excellent and a collectors item.

Dali Minuete $1.6 -By far the prettiest. Walnut glossy. Loved it.

Rogers/Graham LS3/5A $2.5 Best on the human voice. Easily resold.

Fyne -Smaller Coax  2way. $1.0 -Newer company
that represents the Tannoy brain trust. Value!!

If you live anywhere near Fritz or Decware those two are on my must hear list. Some makers will let you have an audition but freight
fees add up.

Happy Hunting!

Please advise what you buy!

The OP is noticeably absent. The great and almighty MC has spoken. If the Raven is neutral, and he would know, maybe look to the Aerial Acoustic 5T or Sonus Faber to get the warm sound you desire

We prefer God Emperor. https://youtu.be/U-1DY0OVvew?t=3174

Upss,  my apologies for not being more active.  I am no familiar with the “ rules of engagement” for this forum. Yes, I notice that MC gave his valuable opinion and I really appreciate all  contributions .  I enjoy a lot the process of buying a new piece of equipment,  for example, I have been searching information for every speaker you have suggested ,  mainly reviews ,  that  increases my knowledge  ( but no my hearing abilities unfortunately  ).  Fritz and Salk  speakers were unknown to me until they  were mentioned in Audiogon ;  fantastic ! Love the concept of a man doing everything  in contrast to the big companies that have  funds to do research and development.
Last night I have another good feeling in these search .   The primaluma pre-amp  that a friend loan me  , is connected to my McIntosh amplifier: I told my wife to spent a few minutes listening to  ( a tidal master playlist fo classic jazz ),   She is not an audiophile for sure,  but I took her  5 minutes to notice something diferent and I was so surprised for her comment : " ….. that sound is like silk” , wow ,  now I know she wont complain when the Raven  and  chosen speakers boxes  arrive home. By the way as you have notice I am not  english fluent,  I am an Urologic surgeon  ( still very active ) living in a town  in the Andes Mountains  , Bucaramanga , Colombia, I know only two other audiophiles in our city  to share the  hobby , so , no,   I do not have the experience you have  even though  I started reading , buying  and trading gear at 15 years old.  Thanks a lot , these forum is very interesting  (and sometimes frightening )