iirc the Difference in Model number on HD-25's is the Cable type & length.
For instance i've got HD 25-C II - & i've got a 3.5m Curly cable.
The SP's are a lesser ohm than the HD 25-II (they have swivel cups aswell)
As a heads up I'd make sure NOT to get the Curly cable again.
Its a bit heavy, where it joins the headphones & the cable destroys itself by pulling itself down & making a loose connection.
So get any HD-25 IIJust not with a 3.5mtr curly cable!
You can also get some insane custom cans aswell http://www.customcans.co.uk
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