Most earphones with buildin microphone makes a hizzing sound. I came across those earphones:
http://www.rha-audio.com/us/earphones/ma450i-black.html



and i do really want them! But i dont want to use anything else other than my n900 for music. If you don't know already, n900 comes with best sound card I ever experienced, just compare the same song with the same earphone on any other device to know the difference.

Back to topic, does anyone have any experience with those earphones and do they work with my n900!?