I know many of you guys either don't use or don't like EQ, but I need to share some stuff with any Hifiman RE-400 owners. I spent a little while this week trying to match the RE-400 to the flat but detailed sound of my HD650, and after some sine sweeps and listening tests I've come up with this EQ setting:
Using Equalizer APO (but settings can be used for any equalizer really):
Filter 1: ON LS Fc 100 Hz Gain 1.0 dB
Filter 2: ON PK Fc 750 Hz Gain 1.0 dB Q 0.50
Filter 3: ON PK Fc 2000 Hz Gain -4.0 dB Q 1.55
Filter 4: ON PK Fc 3200 Hz Gain 4.5 dB Q 2.50
Filter 5: ON PK Fc 8000 Hz Gain 2.5 dB Q 5.13
Filter 6: ON PK Fc 10850 Hz Gain 5.5 dB Q 5.23
Filter 7: ON HS Fc 11755 Hz Gain 1.5 dB
Filter 8: ON PK Fc 14750 Hz Gain 3.0 dB Q 5.00
I am actually shocked how well EQ transforms the RE-400. I'm sure this can work just as well for the RE-600 too, as they measure so similarly.
I was always bothered by the 2kHz emphasis of these that immediately drops at 3kHz, so I compensated for that. I added a little more sparkle at 8k and close to 11k. This helps give them a little more brightness and improved clarity. I'm sort of basing this off what I'm hearing compared to the HD650 in the mids and treble (bass sounds fine to me). Also, as this is equalized for what my ears hear, it may not translate correctly for anyone else, unless you have a similar ear shape to mine. But hopefully some of you can profit from this.
With this EQ, they absolutely blow the Klipsch X10, X20i, and Shure SE425 out of the water for me. It may have to do with the titanium dynamic driver clarity, as sometimes those BA drivers have high distortion. Whatever the case, I'm very pleased.
you remove mids then add treble and bass? That's basically a v shaped EQ being applied to a n shaped headphone, if you want absolute neutrality then I think there are tons of better options to choose from. I like the 2khz bump a lot but that's not the only part of the iem that's exaggerated.