That's my feeling as well. I'd much rather plug them in and listen to them as they were created rather than messing with an EQ. I was lucky as I got to hear them with my music on my player so I should be fine. Sometimes the player can make a difference as well. The Ibasso DX90 I use apparently can be a little bassier than some other players.
I have DX90 and planning to use it with CE6B. Maby I have made the wrong choice. CE told me that The difference between P and B are about 3-4 db under 40 hz if I remember right. In my mind that is not a very big difference.