I would say they're warmer but I found that the treble did pierce my ears more on certain songs whereas the 2900 never really did. I did a partial kees mod by sticking some felt on the metal plate and this did help partially alleviate my issue with the treble. The bass is slower, muddier, boomier. I'm still really fond of the 2200 but I find that the 2900 is pretty much just the 2200 with every aspect of it upgraded. Sorry, I'm not really great at doing comparisons so this is the best I can come up with.