From my Youtube video's notes:
I thought it might be useful to some of our AVSforum readers to share with them the same visual aid that some of us already benefit from, namely an ultra high frequency spectrum analyzer, to help hone in on the specific parts of the hi resolution test tracks which might make identifying them easier, so as to then later focus on that specific
part of the track, in comparison to the lo-res version.
There are several very important things to know before you use my video as a visual aid:
#1. It is impossible to cheat in an ABX test by using this (particular) analyzer, even if you download it yourself, because the option to use it is blocked during actual foobar ABX testing, so I'm not introducing a new "cheat method".
#2. This is for demonstration and educational use only. Always use proper safety precautions and don't listen to the files at loud levels.
#3 The audio portion of the video is low quality and compressed by Youtube, so it is therefore NOT hi-res. To use this video properly you must synchronize its playback to your external hi resolution audio (HRA) playback system. Barring that, you can simply denote the time stamp (displayed on the bottom of the video image itself, not the outer Youtube window) to then later focus on that particular song passage after watching the video.
The video is made of three, hi resolution only tracks, played sequentially. The first and last track are the same: AVSforum member ArnyK's "keys jangling full band 2496 test tones f3.wav" [The f3 part denotes it is his newest, third attempt which makes some slight alterations, and fixes some minor bugs.] He provides a download link to both it and a low res version to compare it to, at the bottom of post #2498
, or so, in the thread : Debate Thread: Scott's Hi-res Audio Test
The 2nd high resolution track, sandwiched between identical tracks #1 and #3, is the pristinely recorded song "Mosaic", kindly provided by Mark Waldrep, founder and chief engineer of AIX Records. The track selected is the current front runner for "most favorite" by people who have submitted their test results to Scott Wilkinson's thread "AVS/AIX Hi-Resolution Audio Test: Take 2", where the track is offered for download in the opening post, both in standard and Hi-Res forms [but with only letter codes so as to not divulge which is which, for testing purposes]. This and his other tracks were selected both for their extended dynamic range and extremely high frequency content, which exceeds the capabilities of the CD format.
The "Mosaic" cut needs no introduction. It is simply one of the best, most finely crafted audio recordings I have ever heard, even through my rather modest audio system. Although both the dynamic range and high frequency extension is clearly apparent, it is done without exaggeration and is completely natural.
The jangling keys sound, on the other hand, can be a little annoying [even though I'm sure Arny's recording is spot on accurate with his use of high-end, B&K 4006 mics] and are known to have more acoustical power in the ultrasonic range than any conventional musical instrument, so as you'll see, the bouncing bar graphs show a very strong signal up there. After 12 seconds of this there is a "training tone" at 4 kHz which prompts the listener as to what to listen for should their system be plagued by IM distortion in the next, brief test tone section. Hearing uniform clicks after this tone is expected, however if you hear faint 4kHz tones after this first one, or other noises (besides the clicks common to both the normal and hi-res versions), you unfortunately have an IM problem.
The last 12 seconds of Arny's track demonstrates what the ultrasonic frequencies sound like when played in isolation from the lower, CD quality only range (which might otherwise mask the ultrasonics from our perception). He has kindly filtered away for us the lower frequencies so we can attempt to listen to just these pure, ultrasonic only sounds as a learning tool.
[I recommend double clicking the video, once it starts playing, to see it full screen. Your browser must allow pop-ups for that to work, I believe.]