LoL
All of you who are doing burn in with sweeps and noise, it will not effect the sound.
Burn in is not done with noise(it takes a huge time with these).
First listen to all the frequency tone with frequency generator at near full volume.
You will find that at some frequency, driver is forcing itself to produce it(clip, noise anything).
Note all those frequency.
Now take pink noise sample of those frequency and burn them about 5hrs at max volume from phone(no amp).
Well burn is used to remove any mechanical resistance from driver and not making the diaphragm more flexible.
Voice coil, spider, and surround is also a factor. And its used to reach ideal F/S parameter.
If their is resistance at 40Hz, then driver will not reach at its lowest as their is peak Q factor affecting nearby values.
Same goes for high frequency.
And burn in will never give you that drastic effects.
Chinese BA tends to be more affected to burn due to critically damped non calculated response. Highly damped movement gets burn to ideal value whereas Knowles make the driver to be critically damped and with better tolerances.
Well after all the frequency point burn.
Do a Gaussian white noise at 30% volume for 5hrs.
You are ready to go.
Why, because an iem has at most 2 peaks