[mikedennis]

I have a nice set of DT 770 Pros but I don't know if they are 80 ohms or 250.

How can I tell?

 

[Dorder]

on the pre-2006 version, the impedance should be on the side of the headband if it's a pro version, or if the fork is silver it's a cosumer version, which means 250 ohm. don't know about the new models though

 

[mikedennis]

On the side it is labeled: 2 x 600.

Any idea what that means??? Still doesn't tell me ohms, huh?

 

[E.B.M.Head]

Then you have an old 600 Ohm model from the 80's.