I bought a second hand pair of 880/600ohms (or so i am told).
I have my doubts because of the following reasons...
1. They are tighter than my pair of DT990 32ohms, not as comfortable
2. There is no engraving on the plug end to indicate impedance rating
3. They work great just from my macbook output or mp3 player, electric piano etc, without need of an amp, and reaches quite loud levels (though not QUITE as loud as the dt990s).
This leads me to believe i have a pair of DT880 PROs, BUT it does not say Pro on the side plates.
I don't know what to believe anymore!!
Any help would be much appreciated. thanks