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Sensitivity states 93dB.
Is it 93dB per Volt or 93dB per mW?
Per volt, Hifiman is known to omit this information for fear of being perceived as hard to drive.
Per mW i believe, Jackula must make his expensive AMPs relative there.
These were made for portable devices as Hifiman stated.
These headphones were not "made for portable devices". In fact, no open headphones are made for portable devices. just because it's 20 ohms doesn't mean it's particularly easy to drive across the entire spectrum.