So guys, I've finally got S7 Edge Exynos version on my own, as I could not find any relevant info regarding audio quality. I'll do direct comparison against LG G5+B&O Hifi Plus, which is almost identical to LG V10. I usually listen on 35 volume on G5 Hifi +. Plenty loud with all my headphones. On 40 it gets already fatigueing after a while, so I stick to 35. This is the same as on V10 as far as I can recall, both have 75 volume levels in Hifi mode. I can get to the same loudness on S7 Edge 3 steps below maximum volume. Of course it is much higher volume level at same loudness. Anyway, S7e can get plenty loud for me.
There is no hiss, background is pitch black on S7e as well as on LGs. Dynamics and extension are comparable. Sounstage is wide on both too. Bass is tight, speedy, well controlled and extended on both. If anything, S7E can sound a hair brighter to my ears, mainly with female vocals, but I am not so sure yet. I need more time with S7E. Apart from loudness / volume levels, which are different, the audio is excellent on both devices. Honestly, I struggle to pick any real difference or flaw in the sound produced from any of them with my gear and ears.
Unfortunately I don't have 2 sets of any of my headphones, so I have to unplug and plug-in again when comparing 1:1. What is little bit annoying on S7e is, that when I unplug and plug-in again, the volume level resets itself to default "blue" level (highest recommended, i guess). I then need to bump-up the volume level every time - depending on the headphones - by 2-3 steps (ie80 or DT1350) or to the max-1 (AKG 702). This makes 1:1 comparison more difficult (the LG's "preparing Hifi" pause adds to it too).
I'll do more reviewing in next days.
So far, I've reviewed some 24-bit material - Duft Punk:RAM and KEF Ultimate resolution disc, 16-bit CD quality, all lossless flacs via PlayerPro app. I'll try Power Amp app tomorrow, I got the trial version and subscribed to alpha testing
Here is the confirmation, that Exynos versions carry CirrusLogic DAC (Cirrus Logic CS47L91 Audio Codec): http://www.chipworks.com/about-chipworks/overview/blog/galaxy-s7-snapdragon-chipsets-vs-exynos-chipsets