A square wave consists of the sum of the fundamental frequency and successive odd order harmonics in decreasing magnitude. The fundamental, third, and fifth harmonics are have a large influence on the square shape. Slight changes in phase will mess up the squareness of the wave. In other words, it doesn't measure flatness of FR.
Square waves are good for seeing slew, overshoot, damping, and ringing. The related step-response is valuable for tuning crossovers and time-aligning multiple drivers. Other than that, square waves can also be used for masturbating to how good looking they are, especially if their form really fits to the ideal.
Yup. That usually helps. No one is going to see r2 plots unless someone sends me a pair. I can turn them around in a day or two if you need them back ASAP.
Lets just say I cannot correlate how a headphone's overall tonal balance is by a CSD or impulse response graph. The frequency response graph is generated by a sineweep, one frequency at a time by Tyll. This graph actually measures the entire spectrum - I will purchase or not purchase a head phone according to this graph
I don't correlate a headphone's overall response with Tyll's or Headroom's graphs - they are not necessarily accurate. I will purchase a headphone based on what I hear, not a graph - not even my own graphs.
... I should have just kept my HD650s and call it a day, because it excelled at CSD, as good as the best. I have them both here right now - there is no contest. Tylls other measurements explain the differences I hear between these two.
The HD650s don't necessarily measure better than LCD2 in CSD. They have a slower decay and have some crud at certain frequencies in the way. The LCD2s actually have an overall faster decay, but some with ringing at various frequencies which some people hear and others don't. As I've said, some LCD2s are better than others. The overhead plots are better at showing decay.
BTW - I'm sitting on a quite a bit of data. Just not releasing any results yet.
Edited by purrin - 10/20/11 at 11:24pm