Yes Sir, I do trust my own ears @ 42 years...and counting.
Got some audiocheck.net tests myself these days at an average-to-loud (no SPL-meter, sorry):
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https://www.audiocheck.net/audiotests_mosquito.php - crazy ass mosquito is trying to kill my only neuron left! I instantly stop it playing...so
17.4 KHz is pretty loud to my ears, but only when using speakers; with headphones I can't actually hear the mosquito...it's like I know it's there, but it's not "disturbing" my ears at all. I'll dig into this some other day perhaps (haven't tested with IEMs yet, but don't think it will change anything).
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https://www.audiocheck.net/audiotests_frequencycheckhigh.php - on speakers
I was starting to hear from 19 KHz, when getting lower to 18-17 KHz makes me cover my ears with my hands, though at 8-9 KHz it sounds probably louder, but it's not so uncomfortable. With headphones, the max. audible frequency was 16 KHz...kinda strange after all, but I'll dig into this some other day perhaps (haven't tested with IEMs yet, but don't think it will change anything).
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http://www.ultrasonic-ringtones.com/ - on speakers
I have no issues hearing the 18.8 KHz and everything else below, of course (I can't hear the 19.9 KHz at all). It's like few dB lower then other frequencies, but not with a huge margin, because my hands were getting onto my ears after the third test consecutive done @ 18.8 KHz. Also, the 17.7 KHz I hear it quite loud and seems that is bugging me much more than the 8 KHz...it's like driving me crazy. On headphones, as per above wrote, the first tone I can hear from this test is 15.8 KHz, though there's some feeling I get something around 17.7 KHz, but can't be sure it's my imagination or just some very low-level harmonics.
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https://www.audiocheck.net/soundtests_headphones.php - on speakers I didn't got more than 66 dB, environment was not very quiet and my 25 cm away desktop with its 8 fans wasn't helping me much either. However, on my closed-back AKG 550 things were much improved and now I can perfectly understand "72 dB below full scale", I can barely understand male voice words "78 dB below full scale" and I can hear that someone is speaking but can't understand what @
"-84 dB below scale". At "90 dB below scale" it's kinda silent in my head...sorry; after increasing the volume to very-loud I was able to get the words clearly, but that's insane so it doesn't counts.
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https://www.audiocheck.net/blindtests_frequency.php - I only got
14 KHz here, sorry. Test was done with AKG K550; on speakers I found the noise as being too disturbing and didn't felt it could be more reveling than with headphones.
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https://www.audiocheck.net/blindtests_level.php?lvl=0.5 - I found this test very interesting, although I had a feeling that the -0. 5dB tone had a higher intensity (-0.3 dB or -0.2 dB perhaps), but it was probably my imagination. However, I got
10 out of 10 here with 100% accuracy. With the 0.2 dB test I got lot of troubles with the -0.2 dB tone...so I find that one as being too difficult for my ears.
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https://www.audiocheck.net/testtones_subwooferharmonicdistortion.php - I get something starting with 24 Hz and the 28 Hz is quite beefy, but depending on the headphone used, depth and impact was different, but at least it was clearly audible. With speakers I got different results, because my MR10Smk3 refused to play frequencies lower than 30-32 Hz, have no idea why. At least my CANTON GLE 496 had no problems here, so I'm quite happy after all.

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https://www.audiocheck.net/audiotests_frequencychecklow.php - same as above.
Some screenshots attached as well.
Tests were conducted on:
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Mackie MR6mk3 +
Mackie MRS10mk3
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CANTON GLE 496 (no sub)
- AKG K550, AKG K701, Beyerdynamic DT880 600 Ohms- balanced
- FOSTEX T50RPmk3, Hifiman HE-560, GRADO SR60i - single ended
Sources used:
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ASUS Essence One MKii Muses +
Matrix M-Stage HPA 3B - for balanced cans only
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BURSON PLAY (w/LPSU) - for single ended cans only
- Pioneer A-209R,
BURSON BANG
P.S.: Some of the above equipment are less or more modded, same applies to some of my cans as well: K550, DT880 and T50RPmk3 have a bit of dumping stuff inside to reduce unwanted vibrations, K701 has
"bass-port mod" &
"theaudiophileworld mod", SR80-i is having L-cushion & front grills replaced with soft and thin fabric.
Later Edit: I was able to do a hearing test with
ASUS Xonar U7 +
Beats Solo 2 closed back headphones, results
here; seems that my hearing is
still OK, around 0 dB loss. Volume was low, carefully calibrated per Audiocheck's recommendations, but inside the room was very quite anyway and this helped a lot.
Seems that the ASUS U7 + Solo2 setup is more helpful for the trebles, not sure if headphones linearity or the way cans are sitting on my ears, but I was able to hear trebles up to 18 KHz. However, still my speakers blow away all the cans I have (with speakers I can hear 19KHz better than I can hear 17 KHz with Solo2).
Tests done tonight to check high-end hearing:
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http://www.noiseaddicts.com/2009/03/can-you-hear-this-hearing-test/- mild hearing @18 Khz, acceptable hearing @ 17 KHz
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https://www.noisehelp.com/ultrasonic-ringtones.html - I can definitely get the 17. 4KHz mosquito, much lower than 8 KHz or 10 KHz, but at least with Solo2 cans
I can hear up to 18 KHz.
Tests done tonight to check low-end hearing:
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https://www.audiocheck.net/testtones_subwooferharmonicdistortion.php -
20 Hz are mildly audible, from
30 Hz and above the impact is maxim.
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https://www.audiocheck.net/audiotests_frequencychecklow.php - same as above, but
20 Hz is having even a better impact, probably more higher harmonics in the sound.
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https://www.audiocheck.net/testtones_sinebursts20-200.php - same as above.
Great cans
Solo2, indeed...unbelievable great bass response with trebles extension higher than any of the above headphones...and all of that coming from
ASUS Xonar U7 (with
LME49726 on outputs) connected to a Lenovo X230 laptop.