I do not know anything about the Mk. I. The N.E.A.R. website is www.nearspeakers.com. You should be able to write to Bill Kieltyka for the answer to your question. I was told by Bill that the Mk. II has a nominal 8 ohm impedance that does not dip below 6.5. BTW, I love my Mk. II's, they are driven successfully by 60 watt OTL amps that are not compatible with low impedance speakers. God bless.
