Map,
Audio Note AN-e speakers are rear ported.
I think they are adequate for sound stage depth although not their priority. I’ve had very critical audio friends over and they commented that they were not expecting sound stage depth and were surprised. I think some of that depth is enhanced by the texture of the mids created by drivers and as mentioned above the carefully braced wooden enclosure and also the rear port. Add to it a 10 watt DHT SET amp and the texture and depth are increased. Over all sound stage is big rich and textured. I feel no dissatisfaction. The combination of a SET amp and these speakers seem to create a different type of depth. A depth created by a beautiful mid range texture. I frequently go to my friends NYC apartment and hear YG speakers driven by CH electronics that are positioned into the room that have amazing depth but unless one has a dedicated listen room having speakers protruding into a living space is usually a problem. At least it would be for me. The depth of the YG/CH system is different than my AN/DHT SET system. I hear the difference and appreciate both approaches. They both have virtues. Some folks use AN-e’s out into the room but I’ve never heard them positioned like that.
You are correct, very careful placement in relation to the corners/rear wall will either add or subtract to the bass, texture and depth. Even as little as an inch either in or out will change the sound. My speakers are about 5 inches from the back wall and what is counter intuitive is if I pull them away from the back wall, I get more bass/depth and if pushed closer less bass. That rear port is most likely having quite a bit of influence. Using silver speaker cables vs copper will also change the bass, texture and depth and require a slight change in position in relation to the corner.
As Erik mentions above I also believe their sensitivity is enhanced by corner placement and very much wife approved since they integrate nicely into our living space.