I found a frequency response measurement of the HE400i that is more accurate than the ones I previously used in my equalizer settings. I discovered a way to extract the graph data from Rtings.com. Rtings.com has measurements of lots of headphones, and their methodology is one of the most accurate. So, I imported their data into Room EQ Wizard and created an equalizer profile to correct the frequency response of my HiFiMan HE400i.
Measurements and Correction
I came up with the filters manually. I’m choosing not to boost the troughs or over-correct the treble to prevent side effects that arise when any particular listener’s ears don’t exactly match this graph.
Handling the Target Response
Rtings, taking advice from the Harman target curve, incorporated a 4dB bass boost into their target frequency response. This, according to Harman International’s research, is what “most” listeners prefer. However, to take that subjective preference out and get even closer to true neutrality, I simply added a -4dB low-shelf at 100Hz to eliminate that artificial bass hump.
Everything sounds very natural and neutral, more so than my previous EQ attempt. I don’t hear any sibilance anymore. The bass roll-off sounds completely fixed, or at least counteracted much more than in previous EQ attempts. Bass texture and definition is much better with the bass hump excluded from the target response.
- Equalizer APO config file
- Room EQ Wizard file – modify the EQ to your liking or generate convolver files
- For use in some other parametric equalizer:
Peak 18Hz 7.0 dB Q=0.800 Low-shelf 110 Hz 4.0 dB Low-shelf 1200 Hz -2.0 dB Peak 3250 Hz -2.0 dB Q=2.500 Peak 7000 Hz -4.0 dB Q=3.500 Peak 9500 Hz -6.0 dB Q=2.500 Low-shelf 100 Hz -4.0 dB