You could always use an equaliser. Simply keep the bass at neutral and lower the other frequencies to compensate.
That way you can control exactly how much bass the can has.
That way you save yourself £70-£90 by buying these over x1's. If you can't be bothered doing that then get X1's.
Only thing is x1s are open backed, which im not keen on, but the k550 make my ears sweat after a few hours...what to do??
I'll need to write up a shopping list i think after some serious review reading.