Hey guys, I'm having a hard time getting any real advice on an issue I'm having. Likely this is because it's a setup not many people go with. \n\nI'm using a single back surround, so I guess this would be 6.2.4. DTS:X content works perfectly as well as upmixed with Neural. Dolby surround seems to work fine as well although the back surround is not used (I knew this going in). However the issue is with Dolby Atmos, not only is the back surround not used to which the processor shows it is active... the processor screws up the rest of the speaker placement as well. Instead rendering it as 5.2.4, which isn't ideal, but would be acceptable, it treats my setup as a 7.2.4 and uses the side surrounds as the back surrounds and seems to simulate side surrounds with audio from the surrounds and the front LR speakers, mostly it sounds like side surround content comes from the front LR. This might be happening with Dolby Surround upmixed content as well, but harder for me to troubleshoot that to confirm. This might be why DTS Neural up-mixing sounded so much better to me. Changing the settings in the AVR isn't great option and is requires new calibration everytime I switch to an Atmos source and back. \n\nPersonally I really think the single back surround seriously helps the rear soundstage in my setup (properly placed SBL\/SBR is not an option). Since the Denon would allow one back speaker officially, I spent a lot of time and money placing that speaker in-wall (and even had to have a contractor re-route a stud and vent pipe in the wall for it). I'm at a loss on how I could combine the LR signal to mono outside of the processor for this, and while that would be better than the broken situation I'm in, it would be better if the processor was handling this for more accurate soundstage processing like it does with DTS content, and this would in-reality make the DTS content worse as the processor does it correctly there. I feel kind of cheated as this means while Denon claims they support this config, it really isn't functioning at all, and I doubt they pay much attention to my issue since I'm sure I'm a rare case that actually uses it for this purpose. \n\nI suppose I could go buy another $1,900 speaker, pay the contractor to open up the wall, re-work the stud and vent pipe further, add a speaker stacked on the existing one, angle them outwards, and kind of make my own bi-pole speaker with separate inputs, but I certainly wouldn't have gone down this road if the processor wasn't supposed to support it? Does anyone know of a different processor or AVR that will accept this speaker configuration? Does anyone know how to properly combine two pre-outs to a mono signal?