80smusicboy
100+ Head-Fier
Bingo! That's how I would describe them, and relate them to the bigger/better/everything HD600, too.
It's that Sennheiser "naturalness" of the sound. These are a bit bassy but they still manage to keep that sweet timbre and the soundstage is quite good for such a small headphone.
And I got them for what I'd call dirt cheap, 32€ delivered. Amazing value!