Thanks for your opinion Peng. We've recently completed a major renovation (light years over budget!) of our main floor but there is still a field of boxes in the Games Room where this system will reside. See
WAF => A new beginning? Where should one start?
I've installed 4 in-ceiling speakers, and 7 at / near ear level as per Dolby Atmos specifications. Even though I never heard immersive sound, I took the plunge as to miss the opportunity with the ceiling down would be folly. Now with the Speakers in place (even though I'm seriously looking at replacing my ancient front 3) the itch to light it up seems to increase every day.
However, my practicality side pulls me back (I wasn't the driver for the renovation - my Misses was...), as most of that system will be used for Cable TV, Music, Blu Ray Concerts (If I can keep getting good ones to buy), a large backlog of 3D Superhero Movies my son & I collected but haven't watched; and not that many standard Blu Ray Movies (which is where Atmos and DTS-X reside). The present Denon AVR-S900W receiver is working just fine now in 7.1 and it's hard to imagine the real impact of immersive sound. I heard a terrible install at a local Best Buy, but that's the only one I've found.
Currently in the Games Room, besides the sea of boxes, is one Lazyboy recliner (in the sweet spot), the system and a 55 inch Samsung 3D LED LCD TV. I do have the Audyssey Mic on my tripod, an SPL meter, and the normal pile of remotes.
If I could turn off my practical side, I'd just suck it up and go for the X6400H and be done with it. If I go X4400H, the only compromise I see is the lack of amplification for two channels, and with the money save I can migrate to 3 CCB-8s to replace the fronts, and feel good about it. The Denon APP will allow me to setup a couple of profiles so switching between say 7.1.2 and 5.1.4 won't be hard. Without the benefit of hearing 7.1.4 versus those other configurations, I don't think there will be a substantial difference in this room. I think adding a separate amp will be simple later if I get the itch, but another Sub would probably be more impactful.