Searching for a little more warmth

Hello all, 

I know this might be a little open ended but I wanted to ask the crowd here for some thoughts and opinions on a matter I have been contemplating for some time now.  

To begin.  My current system is comprised of:

• Shindo Cortese 300b amp
• Aurieges pre 
• Bluesound Node
• Zu soul vi speakers
• Thorens TT

I am looking for a little more warmth and richness from my system.  The low end is there (to some degree), however it often feels as if the sound is having a difficult time filling the room.  I'm not looking for a super boomy low end, just a little more presence from the speakers that is able to fill the room without turning to "11".  The room is decent size, about 16' x 30' with high sloping ceiling.  (Speakers are placed on the 16' wall about 11' apart and close to corners)    

I've gone back and forth on what I believe might be the best path forward and after countless motions back and forth, I figured I'd put this out there to the crowd to see what the group thinks.  

My gut tells me that swapping out my speakers might be the best option.  Currently they are Zu soul vi but I have been considering Devore O/93 or 0/96 or audio note but am open to suggestions.  

Option two might be to leave the speakers and add a small subwoofer.  

Or lastly, consider the source, where most my music is played through bluesound Node, that adding or replacing that Node with a Gold Note DS-10 or (used) aurender might add some dynamics and texture.  

Or... perhaps I need to swap out the system for something with a little more oomph..

Many variables and possible contributing factors, I know.  I figured it'd be fun to see what the group picks out as the weakest link here or suggests as the best path toward a goal.