I received new HD 800S headphone yesterday.
Without any break-in, it did not show any hard edge.
Some IEM like Hifiman need more than 100 hours of break in before harsh treble is gone.
But after playing it for few hours, it seems to show more details and bass resonance.
From the review, I had expected HD 800S to sound bright and be prepared to apply equalization using Lyngdorf 2170 presets.
But driven by Chord Dave and Mscaler, it sounds neutral without any equalization.
I had played Chesky Jazz Sampler and Test disc to test soundstage width and depth.
It shows very sharp and precise focus but falls short of my 2 channel system in soundstage width and depth.
But placement of instrument is more precise with HD 800S than my 2 channel system.
When I play "Surround Sound Demonstration CD" by Telarc, HD 800S gave very exciting presentation with fast and tight bass and precise focus without any hard edge.
I have two headphones and one IEM to compare with HD 800S.
The first one is 1MORE Triple-Driver Over-Ear Headphones sold by Drop at 130$.
This is light, pretty efficient and excellent value at 130$.
But compared with HD 800S, 1MORE Triple gave loose bass, less details and not precise focus.
1MORE Triple is no match at all with HD 800S.
The next one is Empire Zeus IEM sold by Drop(1k$ and 14 drivers in it).
Zeus IEM gave more sparkle with nice details.
But without equalization of 3db down at 6khz, Zeus sounds too bright overall while HD 800S sounds neutral without any eq..
Nice thing of Zeus IEM is very high efficiency to be driven by regular cell phone like Galaxy Note4.
Thus I will be happy to carry Zeus IEM out of town.
The placement of each instrument is slightly more precise with HD800s.
I will prefer playing HD800S to Zeus IEM at home.
The last one to compare is Stax 009S driven by KGSSV Carbon amplifier.
HD 800S gave wider and deeper soundstage than Stax 009S with more precise focus.
But Stax 009S give more musical sound with nuanced details, nice decay , more bass slam and texture.
HD800S give very tight and fast bass but not matching the authority of Stax 009s.
It bass sound like one note without texture.
The conclusion is that it is fun to listen to HD800S with sharp focus, wide and deep soundstage and tight and fast bass.
But HD800S falls short of either Stax 009s or my 2 channel system in musicality.
I will keep HD800S for at least one year to enjoy its precise imaging.
Thomas