Here are some thoughts about the EQ.
Notes about the EQ design:
Good L/R match.
- The average L/R is used to calculate the score.
- The resolution is 12 points per octave interpolated from the raw data (provided by @amirm)
- A Genetic Algorithm is used to optimize the EQ.
- The EQ Score is designed to MAXIMIZE the Score WHILE fitting the Harman target curve (and other constrains) with a fixed complexity.
This will avoid weird results if one only optimizes for the Score.
It will probably flatten the Error regression doing so, the tonal balance should be therefore more neutral.
- The EQs are starting point and may require tuning (certainly at LF and maybe at HF).
- The range around and above 10kHz is usually not EQed unless smooth enough to do so.
- I am using PEQ (PK) as from my experience the definition is more consistent across different DSP/platform implementations than shelves.
- With some HP/amp combo, the boosts and preamp gain (loss of Dynamic range) need to be carefully considered to avoid issues with, amongst other things, too low a Max SPL or damaging your device. You have beed warned.
- Not all units of the same product are made equal. The EQ is based on the measurements of a single unit. YMMV with regards to the very unit you are trying this EQ on.
- I sometimes use variations of the Harman curve for some reasons. See rational here: https://www.audiosciencereview.com/...pro-review-headphone.28244/page-5#post-989169
- NOTE: the score then calculated is not comparable to the scores derived from the default Harman target curve if not otherwise noted.
HF a bit ragged, EQ will be dependent fitting
I have generated two EQs, the APO config files are attached.
Score no EQ: 70.7
Score Amirm: 82.5
Score with full EQ: 97.5
Score with EQ: 90.6
DCA Aeon 2 Noire APO Score Full EQ Flat@HF 96000Hz July172023-145752 Preamp: -5.8 dB Filter 1: ON PK Fc 112.70 Hz Gain -3.51 dB Q 1.80 Filter 2: ON PK Fc 265.80 Hz Gain -1.35 dB Q 3.11 Filter 3: ON PK Fc 1144.77 Hz Gain -1.72 dB Q 4.04 Filter 4: ON PK Fc 2011.98 Hz Gain 2.19 dB Q 1.68 Filter 5: ON PK Fc 3505.70 Hz Gain 5.77 dB Q 2.85 Filter 6: ON PK Fc 5750.32 Hz Gain -5.90 dB Q 3.67 Filter 7: ON PK Fc 7345.30 Hz Gain 6.72 dB Q 5.16 Filter 8: ON PK Fc 13301.70 Hz Gain -9.65 dB Q 4.48 DCA Aeon 2 Noire APO Score EQ Flat@HF 96000Hz July172023-150130 Preamp: -6 dB Filter 1: ON PK Fc 112.45 Hz Gain -3.51 dB Q 1.80 Filter 2: ON PK Fc 264.80 Hz Gain -1.35 dB Q 3.31 Filter 3: ON PK Fc 1143.77 Hz Gain -1.72 dB Q 4.04 Filter 4: ON PK Fc 2020.98 Hz Gain 2.24 dB Q 1.68 Filter 5: ON PK Fc 3498.70 Hz Gain 5.77 dB Q 3.05 Filter 6: ON PK Fc 5595.84 Hz Gain -5.07 dB Q 5.16 Filter 7: ON PK Fc 13304.70 Hz Gain -10.43 dB Q 5.20
Thank you for doing the EQ. I just received the Noire yesterday and was wondering about how to EQ (also new to EQing).
This is my first pair of fancy hi-end headphones, got it used. The Noire replaces a Bayer DT 990 Pro so that's my only comparison. My other 'phones are a B&W P7 Wireless and Audio64's quad driver IEM. It's melting my brain, I've never heard music or even sounds like that. A complete revelation. I can throw all the audiophile language at it but I'm not good with the vocab. All I know is my heart was racing. And it was just as incredible on my Pixel 7 Pro with a Cayin RU6 and no EQ.