I bought these online because of their great reviews and because I love Koss products especially their PortaPro earphones. If I could I would only use PortaPro headphones but there are times when I need to wear headphones so I need in-ear headphones. These Keb30W headphones have incredible sound compared to my more expensive but disappointing Sony headphones which my wife bought me as a surprise. The Keb30W sound great and fit well and have a separate volume control. No noticeable distortion at high volume. Really good bass. Can't call them noise canceling, but they're pretty damn close. This is great value for money and the Koss warranty kills its competition for a reason. They produce a wide range of products. No, I don't work for Koss and nobody I know. It's nice to find a company that still makes great electronics at a reasonable price with an amazing warranty. Be sure to buy them - if you can't use your PortaPro. Update: My wife decided she would take my Koss headphones, so I decided to try another brand - ignoring my own review here. Bought the more expensive "Monster" headphones based on the rave reviews. What a disappointment. The sound is flat and dull. They prove once again that Koss is doing everything right. I will be buying another pair of Koss headphones and gifting the monsters to someone who doesn't care about sound quality or fit!
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