Thanks. I've taken the measurements with two different multi-meters and on probably a dozen occasions. The results are consistent: the drivers on my pair of DT880/600 "Premium" headphones are discrepant by between 25 and 30 ohms.
I am still waiting for Beyerdynamic to return my numerous telephone calls and a couple of e-mails. It's been almost a week, and I am getting a bit frustrated.
That sucks man amazon not willing to take them back?
Ironically I also got my Beyer 600 ohms from amazon as well.
Although they originally sent me the 32 ohm version.