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.
I used of 3 low-shelf filters to create a smooth bass curve that fits and counteracts the bass roll-off.
Everything sounds very natural and neutral, more so than my previous EQ attempt. The bass roll-off sounds completely counteracted, or at least counteracted much more than in previous EQ attempts.
Rtings’s target frequency response apparently has a slight bass boost and downward (dark) tilt, which makes sense if you subscribe to Harman’s theory.
- 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:
Low-shelf 30.0Hz 8dB S=0.9 Low-shelf 110Hz 4dB S=0.9 Low-shelf 1200Hz -2dB S=0.9 Peak 3250Hz -2dB Q=2.5 Peak 7000Hz -4dB Q=3.5 Peak 9500Hz -6dB Q=2.5