Run them in, leave a CD on repeat at listening volume while you go to
work.
After a week they will sound smoother.

Honest? I know that generally electronic change their sound
after being "played in" for a while. This just sounds ...
well, it sounds like my experience, but ... well.... !!

Speakers / Microphones / Headphones are very mechanical devices, glues and
suspensions soften somewhat with use and they always seem to sound warmer
with age to me, which is one reason why new speakers always sound brighter,
they are.

My neighbours must have hated me a few months ago when my old wharfedales
left and some monitor audios arrived in their place - one week of music
while we were at work....