For more mortal offerings, Ortofon's e-Q5 and e-Q7, FAD's Heaven S/Heaven C/Heaven A, Etymotic's ER-4 series and Grado's GR8 and GR10 are some "high end" single BAs.
I would say a custom re-shelled IEM with a BA that's modified to withstand the entire frequency with more oomph without becoming any more distorted. Maybe a re-shelled ER-4? I would say RE272, but that's dynamic and your title says BA
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