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All three of those IEMs are >16ohms (Anole 15-19). No surprises there. Hence my note about context, above.
Yep, higher driving voltage (power) and lower impedance are the contributing factors with some of these iems. And to resolve the issue we use iEMatch which a) like a voltage divider lowers the output (thus you have to raise the volume to compensate for it), b) changes the impedance of IEMs because resistors of the adapter are now in series with crossover inside iems.