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You can remove the foam ring behind the ear pads if you want more treble. The sound is too bright for me without the foam ring but it does sound clearer and the soundstage is larger.
I think people without the rattle issue are just not playing their HP loud enough. The rattle is caused by cone breakup with low frequencies at loud volume (105-110 dB should do it). People with the rattle problem at low volume probably have something loose inside. The rattle problem isn't that big of an issue since most people don't listen at extremely loud volume. It is disappointing since the HP is rated for 200mW but cone breakup seems to occur at under 40mW and creates the rattling sound. Again, if your HP aren't rattling at low frequencies then you most likely aren't playing them loud enough for cone breakup to occur.
Even short burst of audio at 110db can permanently damage ears., so any rattle at this level is the least of your worries! I think I need to download the test tones and play them at just over the level I will listen to music at and if I don't hear any rattle, I'll consider them fine.
Low frequency test tones were only at 80-90dB due to low end fall off. Regular modern pop music would be around 105dB at the same settings. Some might have diaphragms that breakup at a lower volume than others. That would mean a small amount would hear the distortion at around 100dB if their music has a lot of low bass. Most people shouldn't have a problem with this since they probably listen at 80-90dB. It's only a problem for people who like to listen extremely loudly and those that listen to music with a large dynamic range (60-110dB).