Thanks for all the hints, Ive been looking all around and Its very weird, sony claims to have such a response range but there's so little information and reviews about their headphones...

I think Ill buy the sennheiser cx300 just to compare to my old sonys (to see how good or bad they were).

I may try the Shure SE530 later on. They are probably the most expensive ones I can afford (with good quality).

Btw, any considerable difference between the cx300 and the cx300 II ?