Title: Adjust the Frequencies and It's a Great Set of Headphones
Product review: I ordered these headphones because my husband has a pair and he loves them. So I disregarded the negative feedback about hissing noises. I was using an old pair of Sony's that had to be smacked to work any longer. When the Sennheiser headphones arrived I fully charged them and was surprised that I had a terrible hissing/static noise. I thought they were defective until I went to the Sennheiser site and downloaded the instruction sheet. I found out that there is a lever on the base that adjusts up to three different frequencies. I moved it over a notch and voila! the noise went away. I've suggested to the sellers that they include that sheet with the headphones to avoid confusion about this feature. While there is the faintest hiss in the background, it does not affect the sound. So I am very satisfied with the quality of these headphones and would definitely recommend them to others.
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