Well gotta appreaciate the speed of speed post. I expressed my difficulty of sending the Autumn back and Ms Zhou told me I could keep it. No, I am a nice person and I am sending it back.
My first impression is it's quite a bit darker or mid-centric with my beloved 8 core 22awg Hakugei Healer cable than I expected and I am not sure yet if I can hear the BC unit. Maybe it really needs a lot of burn-in? Swapped to a brighter cable and the sound opened up but the stage is still on the small side and still a bit mid-centric.
The shells are big but light and I think they fit me ok, just not sure how much of a seal is required to get the most out of the BC.
And the graphs:
vs the Autumn with normal filter:
Look quite similar but quite different sounding.