Originally Posted by bhazard
as of now they sound very restricted bass wise, both in extension and quantity.
Hmm... Interesting. If this is not a bad seal or a bad sample, still another possibility is that you are accustomed to headphones that have more bass than neutral. For example, ALL the headphones I have tried so far (about 20 models) are more or less bass oriented, even including the SRH440 (I am not talking about extension, but amplitude in 60-90Hz) compared to my reference speaker system that measures flat. Of course, I have not tried, say, the Shure SRH1840 or the Audio Technica AD700 or AD900, which should not be bass heavy according to measurements.
By the way, burn-in will not do the trick for you. It may change the tonal balance a little, but will never cause a significant change. If you feel a large change, it is only in your head---people who measure drive units know this. Bass response of a driver is accurately predicted by T/S parameters. There are quite a few measurement data that show that T/S parameters before and after break-in do not change substantially to the point affecting perceived sound.