My Zu Def 4s are places within 4" of the back wall and give a wide sweet spot. While they are pricey, you might call Zu to ask whether their other speakers have a similar characteristics. I also second Audio Note.
Floorstanders with a large sweetspot
I'm looking for a pair of floorstanders under $2.5k new or used that (1) can be placed close to a wall and (2) have a reasonably large sweetspot. I will drive then with an integrated tube amp, TBD based on the speakers. The room they will be in is 12 x 18. Any recommendations are welcome. Thanks.