[cnico88]

I just bought a brand new pair of these cans from Amazon and I noticed that the left can (in which the whole noise canceling equipment is encased) makes some strange noises. I owned previous noise canceling headphones before so I know how they are supposed to sound and work. I get a very faint but noticeable squeal during mid to high notes and it is very annoying. Also if I put my finger close or over the left can't mic it will squeal extremely loud. I listened to them for about 8 hours now, I thought they would need to be burned in but the sound is still there. I have the option of returning these bad boys within seven days, but I am not sure if they are supposed to do this at first or if the left mic is just not functioning properly. Because time is of the essence here I would really appreciate all your help. Thanks.

PS: I just noticed that the squeal is present at higher volumes when there is human voice, in ambient music or sound the squeal is not present.

[Oreo]

Burn in can take 600 hours..

Leave them playing for a entire day or something, but to me it sounds faulty. Unless, are you sure its not sibilance of the S sound. There can be a high pitched squeal that sounds like a ''TTTSSSS'' on any words beginning with T or S when sung.