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Orthos have no dampening factor so not affected by impedance.
With planar magnetics there is little to no effect from damping factor, but some amps do require some attenuation to reduce audible background noise.
If you want the full scoop, dig into Speaker Amps for Headphones. Its worth the time to read from page one.
Just had my first listen of my new HE-6 for 30mins. Loving the sound entirely! Bass is a bit looser than Id like, the culprit is the pioneer receiver Im currently using--its still very good nonetheless. The most impressive thing or what 'wowed' me the most is just how airy it is. The airiness from these HE-6 arent found in planars imo. Bravo HiFiMan, bravo.