Yesterday, I received this graph from Franck - Earsonics with the note: "After 15Khz, there is a big atténuation due to the testing systeme reflection phase annulation accident of our synthetic ear". Same as most of us, Earsonics does not want their customers making decision based on the graph but what they actually hear. That is why we do not see Earsonics publish technical measurements on their website. The notch at 5KHz as you can see in the graph (around -5 to -10dB) was made intentionally to avoid aggressive and sibilant treble. By the way, I, personally, prefer this thread will go as the old way, more impression less graph or technical measurement.
The data above is most likely derived with a 2cc coupler, which is basically a metal tube with a mic attached at the one end, not to mention that the 2cc coupler doesn't reflect ear canal impedance. It seems there is a low-resolution smoothing applied too. This is the exact same shameless behavior that I had with Heir Audio, when I presented their 3.Ai/4.Ai data. Measure 3.Ai/4.Ai with a 2cc setup, and you will see a flat response with no dip(Tinyman should be well-aware about this, right?)
And, especially, this statement from Franck: "After 15Khz, there is a big atténuation due to the testing systeme reflection phase annulation accident of our synthetic ear"- is a complete nonsense. Occluded ear simulators that comply the relevant international standards do not introduce attenuation above 15 kHz.
If anybody, including Earsonics themselves, feels unjustified with my data, please feel free to send me your pair of SM64 along for analysis. PM me, and we'll arrange a deal. Personal calibration comes free of charge!
Edited by udauda - 6/4/13 at 8:01pm