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How to interpret various graphs?

post #1 of 4
Thread Starter 
Hello, I am looking to learn more about the technical side of sound reproduction in headphones.

Can someone explain what each of these graphs mean/show and what they should look like in the perfect headphone (i.e. ideal)?

These are HD800 graphs from ryumatsuba.

Thank-you.



サイン波応答 Sine wave response




位相+高周波歪み -Frequency phase distortion




インパルス応答(CSD) Impulse response (CSD)




インパルス応答(録音波形) Impulse response (waveform recording)





100Hz・1kHz・10kHzサイン波の再生 Play 100Hz · 1kHz · 10kHz sine wave

post #2 of 4
Here's a good post explaining graphs in general (related to headphones).
post #3 of 4
The harmonic distortion looks much too high. There's about 7dB between harmonics and fundamental for some of those bins Not to mention the harmonics are higher than the fundamental below 50hz. Anyone know whats going on there?

Edit: whoops didn't see the harmonics are 40dB lower than indicated.
post #4 of 4
Thread Starter 
the graphs I am particularly interested in are the impulse response ones
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