That's right me too.
Let's wait for The Shadow with pleasure!
By the way, you use P-51. If you are interested in Westone UM3X, I recommend it.
Its earphones match P-51 which gives me very clear, crisp & speedy sound with powerfulness. By Its combination, I have gotten very pleasant sound.
With The Predator which has adult, mature sound with vigor (after burned-in over from about 600 to 800 hrs), I use UE TF10Pro which has so extended high.
The Predator adjusts the sound of TF10Pro well.
(About ATH-ESW10JPN, Both amps match it IMO)
How will The Shadow sounds!!