gancanjam
100+ Head-Fier
I used to have HD800 which i sold it, what i didn't liked about HD800 are it's rough treble, little leaner sound, for many the bass in HD800 would have been satisfactory but not for me.
Last month i borrowed HD800 for 2 weeks and listened with FCN-10/FA-10, good pairing ! sound stage was still wide, treble was still plenty but much more enjoyable, bit more musical and though it didn't boost the Bass much, it was tad more present with FA-10. Overall, HD800 pairing was good and i was doing longer listening with this setup.
I have never listened to HD800S though but what i recalled on my earlier discussions with it's owners were, HD800S has similar DNA as HD800 but with more warmer & musical tone, if that's the case then i am guessing HD800S & FA-10 will also be a good pairing.
I liked FA-10 with most HPs including Abyss 1266, HD800, HE1000 and the only HP pairing i did not liked is Utopia. Now with my new Simaudio Moon Neo 430 HAD which to me is an upgrade to FA-10, it sounds great with most HPs especially with Utopia but not with HE1000. So guess i cannot discard FCN-10/FA-10 now but have to keep it for HE1000. Seems there is nothing like One shoe fits all in Audiophile world