Quote: LOL. I'm going to re-measure them at the request of the owner. I could have messed up on something. They don't sound as bad as the graphs suggest. The CSD plots measure energy content over time across all frequencies based on a "sound burst" that excites all frequencies. They are sort of like a FR over time (technically not really as they measure energy throughout the band in successively smaller windows over time.) It is a good tool to "see" driver ringing (seen as ridges), which typically sounds bad, and to see how fast the driver decays. See this post for what a perfect waterfall plot might look similar to. For a perfect response, the decay should be immediate. You see a wall (meaning all frequencies are excited) at the beginning. The next few fractions of a millisecond, you see the wall fall to absolutely nothing. It's very evident that headphone drivers are far from ideal. Some much less ideal than others.