ATH-M50X : Standards

They are not the flatest or truest of headphones out there but I believe that this is totally fine because they are close back headphones and their prime purpose is monitoring the sound in recording situations.

This can explain the bass and higher frequency bump these have as it can make it easier to hear some things while recording without turning the volume all the way up.

Also while recording and hearing a rough mix of a project or playing with sample libraries (orchestral libraries, etc) the raw unmixed sound is usually dull and dark. The bump that these headphones have, make it sound a bit more pleasing and give it some clarity, something I find really helpful in this stage of the production.