Full range speaker recommendation

What are the sound qualities are are looking for/ What do the ATC's lack? Are you wanting stand mount or floor standing speakers? Keeping the REL subs? Do they integrate well for you... enough to use with the newer speakers?

op - as mentioned above, you need to specify what you are hearing now, what you are seeking to improve, what music you listen to, how loud, live or dead room, setup/placement limitations (dual use room, or dedicated) and so on... photos of the room would help

more we know, more we can recommend something that will work well for you, otherwise we are kinda shooting in the dark...

ATC’s seem a little lean to me. REL’s are great and would be keeping them. 
Mostly listen to jazz, classic rock and a little classical. 
Room is dual use with a small recording studio and baby grand. 
Listen at a little above moderate levels. 
 

Not sure how to add photos here