Smaller than Paradigm Atoms. Huh. They make really good wall mounts for the Atoms. I used Atoms for rears for awhile and they were fine. Paradigm used to make a speaker called the Micro in the same line as the Atom only smaller. You may want to ask around. The Athena will work but I always believe in staying voice matched all the way around. That way if you do multi channel music it will sound right. If all you are going to do is Hollywood crash bang movies then you can put nearly anything in the rear.
Good point on the multi-channel music. Micro is about the same size as the s.5 but it is one inch deeper. I will either go with Atom+s.5 or Atoms-only or s.5-only. Micro has smaller driver and completely different tweeter than the Atom.
All Paradigm series speakers are voice matched so the Micro would work though I'm not sure if I would use it. Another set of Atoms is a good choice. Also Paradigm makes a Cinema series which has some wall mount speakers. Enjoy.
Is Cinema series voiced matched with Atom (Performane Series)?
Is it a very bad idea to mix different brand for centre and side/surround speakers? e.g. CC170 centre + 4 Athena s.5?