This is the fourth or fifth Sennheiser earphones I have purchased, and the very first that did not please me. In fact, it might well be the worst pair of stereo phones I have ever encountered. The highs are nonexistant, and the lows are so heavy, the sound actually breaks up on truly low tones. No amount of correction could compensate, either. I know. I tried. The attenuation of the high frequencies actually starts at 800 Hertz. I am truly disppointed, and had I less confidence in this company, (previously), I might have retained the packaging, etc., and returned the phones.As it is, I am stuck with them. Somebody suggested they might "break in." If so, I will play music into them endlessly, but certainly without listening. It's that painful.