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Just to update- I just plugged in this exact combo. I already have the 9038S capped for safety at -13dB using their Tweak app.It absolutely is enough. They aren't the easiest to drive iem ever but the 9038s (I still maintain the single ended D is better as you don't have to recable) is one of the most powerful dongles ever. Assuming nobody is adding any large eq peaks to the Red (or using the bass adapter).
Then using UAPP on Android - I get plenty loud enough (EQ disabled) at -5 dB when playing some EDM type music.
So for me, on "normal" recordings without EQ I have somewhere between 15 and 20 dB of headroom. Really quiet recordings, desire to add big EQ peaks etc should really all be do-able with this set up.
FWIW I have successfully run the Red with the EU voltage hobbled version of the Apple USB C dongle - but am not a particularly loud listener. I would probably want more than that for the Red given any of the above considerations.