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There is a simple way to see if high-resolution music is worth it or not. Buy an album that was recorded and produced in 24-bits. Downsample it properly with something like Voxengo r8brain, which is free btw. Listen to them. See if you can pick out which is the CD-quality one and which is the original file. That should lay the issue to rest and tell you if high-resolution music is worth it for you.
I am probably in the minority, but CD is the best bang-for-the-buck right now. You can get good-sounding ones, you just need to do your research on the best masterings before buying.
Another option is buying it on vinyl. If it's a new band or newer release where the CD is mastered poorly, odds are that the vinyl is not mastered poorly. Then just record it into your computer and burn it onto a CD.
Yes, that's a point that I have not bought any HD-audio. At the current price I don't intend to. However I came across one website which allows us to stream some clips of HD-audio examples. I will look for more with the intention of finding some with CD resolution to compare with.
"HD" audio is a scam. Red Book (16-bit / 44.1 kHz) is the highest resolution human ears benefit from. The only reason some hi-res downloads sound different is because they were derived from a different master. When you convert them to Red Book, they sound the same. So if it's a better master than the CD, it might be worth the money. If it's the same master and you already own the CD, you'd more or less be wasting your money. Unfortunately, the digital music stores normally don't disclose details on the master that is used.
Anyway, read this to get a grasp of the science behind all this: https://xiph.org/~xiphmont/demo/neil-young.html
OK. I have started reading the link, but wow it's long. I will finish it though, even though I already understand the principles of HD-audio.
However this example/quote from it makes no sense, being where I have read to so far. (Under the Spectrophiles heading.)
"These near-IR LEDs emit from the visible boundry to at most 20% beyond the visible frequency limit. 192kHz audio extends to 400% of the audible limit. Lest I be accused of comparing apples and oranges, auditory and visual perception drop off similarly toward the edges."
It's a pointless analogy. The initial extra data we are looking for in HD-audio, is not 20KHz plus, i.e. above the hearing range. What we want is the detail of the hearing range spectrum. I have added why CD quality misses some detail below.
This diagram from the page makes no sense either. They have made a caption which says the signal recover the exact blus shape on playback.
The reason this is a poor example is exactly the reason why HD-audio is said to work. OK, if you have the patience I will explain. I have counted 32 samples on this single sine wave, and it would re-create a good example of the original wave. However and big but here. This only works for very low frequency sound waves. The reason is this. A sound wave of 10KHz will have 4.4 samples on it at sampling frequency 44.1KHz. Simple isn't it.
The higher up the sound frequency spectrum you go, then the less sample per sine wave. At 20KHz you get 2.2 samples per sine wave. OK you can argue most of us do not hear 20KHz. However some of us do, and young people do. Sound at 15KHz we will only get three samples.
The problem with such low sample rate is you miss data. E.g. with only 2.2 sample per sine wave. If the sample fall at the 0' and 180' of the sine wave, then you hear nothing. (0' and 180' being the start and mid point of the sine wave.)
At 10KHz and only 4.4 samples per wave, the sampl points could fall at roughly 45', 135', 215', and 315'. It means that you would hear the frequency of the sound, but at only half amplitude. This is why CD audio misses data.
We can argue there isn't a vast amount of sound data and instruments that play 10KHz and above. However there is a lot of information. It is precisely the high frequency stuff that gives instruments their individual sounds. It's the harmonics amplitudes that produce and instrument's timbre. I am not sure if we need that on playback because the harmonics have already constructed the sound. (If you know what I mean.) However you can not write off sound data above 10KHz.