Be careful of getting counterfeits. The left channel on my old Sennheiser CX-300 headphones failed a few weeks ago on a ride, so I had to toss 'em. Without equalization, the sound was rather muddy and the bass was overbearing. I promptly bought a new pair, and they sounded much better right off the bat. I also bought a pair of CX-400s, and these also sounded excellent. Also considering that I bought my first pair on eBay, I'm pretty confident that my first pair was a fake.