Originally Posted by TMRaven
Good stuff. I was hoping for less decay with the velours as well, but I guess I wasn't thinking the HE-400 would be such a clean headphone in the first place. Strange how the fr difference is shown better in the csd and not the actual fr measurement. Both graphs do show it to minimize the little hump around 1khz, which is what I heard first when I put the velours on.
That's because FR measurements are just pure tone sweeps, but sharp dips in FR are almost always smoothed over when a non-pure tone around that frequency is played, so unless you listen to music with tons of clean pure frequency tones, those are non-issues. In the case of the sharp dips in the lower treble of HE400s, if you compare FR against CSD (which actually traces the FR curve perfectly at time = 0), you can see all of the dips are smoothed and filled out about 0.05 milliseconds after the impulse.
False dips that appear in the FR but not in the CSDs are essentially measurement artifacts, because of the nature of how the two measurement methods differ.
Edited by jerg - 7/19/12 at 5:27pm