one was multiple choice in random order by format 128kbs 320 and flac lossless and I had a 85% success rate and only got the first 2 wrong once I figured out what exactly I was listening for I got 100% from the 3rd on to the end.
And the 60k khz I listened to a pure 60k tone and correctly called the initiation and termination of the tone several times with my eyes closed soley by sound .
To be honest both tests I mean the variant from even 128kbs to lossless was incredibly not noticeable I had to really concentrate to hear the lac of compression of FLAC
And the 60khz tone Again the difference between that sound and nothing as it went too high was .0000000001% I actually heard it above the ambient tinitus frequency .
And It cut out at 70khz as I tried to call the initiation and termination of the tone but it just bled into nothing . I think I may have heard it but I couldnt be sure and I certainly couldnt call the start and stop . Whether this was due to the super tweeters lack of ability to reproduce the 70khz tone reaching its threshold or my limit to what I can hear I dont know . But I was using a studio monitor allegedly capable of 60k khz and I did call the start stop several times with no warning or time scale to start listening .
I am an anomaly with my hearing . its incredibly sensitive . My dead zone is about I dunno 12-18k khz as that is the ambient resident tinitus frequency that is present all the time.