HiFiMan HE-400 versus the Beyerdynamic DT 990 Pro

Q: Is the HiFiMan HE-400 a big step over the Beyerdynamic DT 990 Pro?

A: It depends on how well you amp the HE400s. They are different from the DT990s in 4 ways:

1) HE400s have a flatter frequency curve. You'll notice the mids coming forward compared to the 990. A lot.

2) The bass is tighter and more controlled than the DT990. The bass isn't as prominent as the DT990, but "punchier".

3) The treble is harsher and more sibilant than the 990. Cymbals and hi hats go into "attack mode".

4) The HE400s are heavier and a lot less comfortable than the 990s. Over time you will get used to their weight, though.