I recall originally reading how flexible Dolby Atmos would be. It sounded like you could arrange any speaker configuration you wanted (within the limits of available channels), tell the controller/decoder where your speakers were in the room and if a sound was near that speaker it would utilize it. I thought this was the whole purpose of effect based encoding instead of channel based encoding. So why then does it seem like every thread I read about Atmos I see 5.1.2 or 5.1.4 or 7.1.2, etc. and lots of people complaining they can't afford the 7.1.4 config they would ideally like to have so they have to settle for either 5.1.4 for better 3D Atmos or do 7.1.2 for better compatibility with regular 7.1 soundtracks and/or their current setup (which might include already wall mounted or in wall speakers etc. that aren't so desirable to change just for a limited number of Atmos titles? What I'm getting at is why couldn't you set up a 7.1.2 configuration (or even a 6.1.2 one) where you have ONE of the height channels (mono) in the front of the room and the other one in the back instead of just two in the front??? Let the surrounds pan with the height channels to provide left/right height clues and you have something that I think would sound reasonably close to 7.1.4 and cost a lot less (6.1.2 would have rear surround in the center instead and rely on side surrounds for "some" basic directionality while planning.). How well it would work would depend on the room and types of speakers but it sounds better to me than 5.1.4 or the expected/lame 7.1.2 that would leave you with no height information at all in the back if the room. My question is are ANY of the receivers out there capable of creating such a setup or are they all tied to preconceived rigid setups that utterly defeat the point of Atmos??? I could have 6.1.2 in that configuration today with only a new receiver and one pair of PSB XA speakers (one front sitting on my center channel speaker and one on the rear channel speaker firing at the ceiling) without moving a single existing speaker) and maintaining full traditional 6.1 "ES" type compatibility with existing 5.1, 6.1 and 7.1 soundtracks at minimal cost compared to trying to rig and pay way more for a 7.1.4 setup that won't fit well in the room at all? Is Atmos flexible or not? Or are poorly executed implementations to blame?