Here are some thoughts about the EQ.
Notes about the EQ design:
- 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 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 more neutral.
- The EQs are starting point and may require tuning (certainly at LF).
- 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 need to be carefully considered to avoid issues
- Not all units of the same products 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.
Incredible L/R match.
I have generated one EQ, the APO config file is attached.
Score no EQ: 39.4
Score Armirm: 67.8
Score with EQ: 85.1
Apple Airpods Max APO EQ [email protected] 96000Hz August092021-100955 Preamp: -9.3 dB Filter 1: ON PK Fc 2236.11 Hz Gain 4.95 dB Q 0.91 Filter 2: ON PK Fc 4196.10 Hz Gain 7.00 dB Q 1.89 Filter 3: ON PK Fc 7352.39 Hz Gain 6.93 dB Q 3.79 Filter 4: ON PK Fc 13267.20 Hz Gain -4.66 dB Q 3.47
always appreciate your contributions. Maybe I should know this, but... is there a simple way to turn these APO setttings into .wav correction files such as can be imported into Roon for convolution? thanks!