Hmm, I just got mine in. At first, I thought the sound was quite terrible...the highs were really high and the mids and lows were very muted. I hopped over to amazon and read reviews that the sound quality was good. So I figured something had to be wrong. It turns out the reviews pointing out the bad construction of the extension cable were correct. I have to bend the connection with the extension cable for the full sound to come through (kind of like how you bend a glow stick to activate it). There's something wrong with the contact in the extension cable for me. I pulled out the extension cable that came with my old Sennheiser headphones and that worked really well, no need to bend the connector. I guess I'm better off getting a third party cable looking at the reviews. They do sound really nice though, strong bass and highs. I still prefer my HD600 headphones though, these need a bit more of the mids (or less bass) for my tastes. I'm curious if I can get a new cable though...