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I had some HD 25's arrive today, and discovered that they aren't HD 25 1-II, but HD 25 II (without the 1).

 

The box has HD25 II on it, and they do not have a right angle cord.  The left headphone has got "HD 25 II" printed on it, with 70Ω underneath.  I understand that the 1-II has "HD 25-1 II" printed on it - which makes me think there might be an electronic difference

 

I've had a google and a search on here, but can't find much, Can anyone tell me the differences between the units please, I'm not sure whether or not to return them.  Thanks.