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Posts by gainphile

  SNR: The inductor induced 0.5db loss which is quite insignificant considering the headphones' sensitivity. This loss would affect the both the 'signal' and 'noise' so SNR would be the same.   THD: This is quite a meaningless number by itself. I have a full plot of harmonic distortion profile from 2nd to 4th order below. Except few areas where the resonances takes into affect they are all 40db below fundamentals. This is way above what normally active electronics like...
It turns out that the headphone can be equalised with passive EQ. This makes things very easy.   http://gainphile.blogspot.com.au/2012/05/audio-technica-ath-ad700-correction-eq.html  
  Thanks. I have not considered HRTF, just a mere correction of Frequency Response. I'm pretty new at this.   But for sure HRTF and also Equal Loudness Contour plays a big part on how the sound is perceived. Not exactly an easy subject to tackle at once too !    I'm interested in having a microphone at the ear.... how exactly did you do this ???   I will study the O2. Sounds like a popular product ?  I just found out an op-amp is enough to drive the headphones (cMoy...
  This was my first time of measuring headphones, and I must admit I did not expect such non-flat response above 1khz.   However a quick glance to other independent measurements it seems this is quite normal. Perhaps due to them being basically 2" fullrange speakers with expected cone breakup mode.   Here is Stereophile's measurements on AKG K530, Audio-Technica ATH-AD700, Beyerdynamic DT440, and Grado SR80. They all have typical breakup response above...
I'm discovering a new world of headphones. My ATH-AD700 arrived today    This is the raw measurement data of the headphones:         And after EQ:     These are temporary notch filters while I'm planning to build a headphone amp (any recommendations?). But they're good enough I think.   The notches are here: http://gainphile.blogspot.com.au/2012/05/audio-technica-ath-ad700-correction-eq.html   Later on I will DSP or build an ASP of...
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