Earfun Free Pro 2 - reference tuning for all resonances

I finally prepared some further settings to cover additional ear canal resonances and will need your help to optimise those settings by some trained ears.

My own setting was achieved by endless hours of listening and fine tuning towards neutral references like various speakers and headphones. The achieved response was then measured with my own ear canal resonance of around 6000Hz which results in the following curve. You can see 3 different measurements trying to match my resonance as close as possible every time, but nevertheless they still start to differ in the upper frequency region, overlaid is also a smoothened average of all 3 measurements which I used as base for all further settings:

I tried to stay as close to this curve for all other settings above 4khz and only adjusted the filters above, retaining the response below more or less untouched, although the region below 4khz will start to differ for other resonances in the graphs, the perceived sound should still remain the same. 

Here the measurement of the 5450Hz setting which shows a peak appearing at 16khz that may be hearable or not, unfortunately I have little control above the range above 14khz as I cannot verify the perceived result with my own ears anymore:

5600Hz:

5800Hz has a dip at 18.5khz which shouldn't be an issue as it may represent the natural response at this particular resonance anyhow:

I prepared 2 different settings for 6250, please let me know which works better for you. 1 is with the 16k filter left untouched, 2 is with the filter adjusted to match my own response better for this region:

You can see how with 6500Hz suddenly mids start to differ thanks to deeper insertion into the the couplers, the final result should still sound the same as before, just the measurement looks different:

I created again 2 diferent settings for 6750Hz which seems to be the most common ear canal resonance range. 1 is with the mids left untouched, 2 is where I tried to adjust mids to follow my original response, but I think despite looking nice from the the measurement, 1 (blue) should sound more correct, please someone confirm that.

Together with the main ear canal resonance also the 2nd harmonics will shift, therefore the dip I personally get at 12750Hz is also higher here, I am not sure how this will affect the final sound though, neither did I try to tweak anything above 14khz too much. I hope it can be optimised by you. Here the 7000Hz setting:

Due to the shifting resonances it becomes harder and harder to match my own response perfectly as you can see from the 7300Hz measurement:

7650 is the highest I could measure without additional modifications:

The 7650 setting should not only represent the real bass amount  in a more realistic way, but also give a better idea over the overall response, as it's measured close to the "standard" 8k coupler resonance. Also overlaid is the Harman target and you can see that they align nicely above 1khz, but I start to deviate in upper mids and above, I also prepared an alternate setting (red) where I tried to stay closer to the Harman bass curve, but it sounds just wrong IMO. I will also post some additional bass variants in a separate post. With "reference" I tried to stay as close to flat and neutral as possible, which should also allow for a correct monitoring of my own upcoming recordings:

Keep in mind that except my own setting which I achieved with my own ear and my own unit to achieve a "correct" sound which was measured at a 6000Hz resonance to finally get some "curve", all other settings are just based on measurements derived from my own curve and it comes down to how precisely the measuring couplers can translate my own curve onto other resonances and how close that result will still sound to my own setting applied to another unit, listened with other ears. Therefore I will need your help to optimise these settings and would welcome everyone to share any suggestion for further improvement. I willl prepare a separate post with all settings manually optimised by you that may lead to better results than my own settings. 

Please also let me know if the new reference tuning is an improvement for you over the old "neutral" tuning.

Update: I created additional settings filling up the gaps between the existing ones. Now you can select from 19 settings covering a range of 5450-7650Hz with a 1/2mm ear canal length difference between them all. This way you should be able to find a setting matching your own ear canal resonance quite precisely with additional option of fine tuning by adjusting the insertion depth slightly. Below is a measurement of all settings so far. You can see that I tried matching the range between 4-13khz as good as possible. The visible difference below 4k is rather a measuring limitation. Above 13khz it's very hard to not only measure precisely but also match the response because it will vary too much with even the smallest changes in position.

Any feedback or suggestion is welcome!