Since you've suggested the 8000 mAh battery, maybe you can go research the dimensions of what a typical 8000 mAh battery pack is, and tell us? We can then add on about double that thickness for the other parts, e.g. PCB board, screen, etc. and then we can decide whether that final size is acceptable to people. Personally, I'm willing to wager that it'll be far too large for most people to consider as a portable device.
Also, this thread is getting off-topic. We're discussing the merits of (2x) ES9018K2M versus (1x) ES9018S, not the overall specifications for the X7. That discussion should be perpetuated here: http://www.head-fi.org/t/715372/feature-suggestions-for-x7-flagship-dap
Edited by tomscy2000 - 4/30/14 at 10:35am