There's really nothing wrong with the bass of the T70, there's plenty of it and it does have amazing sub-bass, it's just not emphasised. There's also nothing wrong with the earpads, they have a good seal and I do not need to press the earcups to hear this sub-bass. These headphones are misunderstood. IMO applying EQ to these headphones is criminal. The way I see it, they are so accurate, neutral and colour-free that they are more like a scientific tool for analyzing audio.
I've been so impressed by them that I might buy a second pair, so that in the future when the one's I currently use start to wear out, I have another new one that will replace them.
But first i'm going to buy the T1. That is all one really needs in this hobby isn't it?!.. 2 top class Beyerdynamics (one open-back and one closed-back - best of all worlds!)