mab1376
1000+ Head-Fier
What is the major difference? I like the look of the 2900 more but the specs look identical otherwise.
I would go for the 900. Closed, so you have a lot more flexibility when and where you use them. They probably have better bass as well due to being closed. You can also Kees mod them to various degrees, which I am not sure works with the 2900.