Riffing on what @Willem posted while I was typing away...
I think we might need to hit reset on where this is going. There is a hard limit on human perception. Despite many subjective opinions, there is little to gain in going beyond 16 bits 44.1kHz. Dogs and cats, of course, have a different perspective, though it would not apply to recorded music. Check this out to see how stuff above 30-40kHz is white noise.
The numbers show high bitrate MP3 and AAC (320kbs and 256kbs respectively) will be fine for your music. Let’s pull a baseline from an industry that needs to get this right: broadcasting. Here is a guide showing the bitrates you need with various formats to get transparent sound (perceptually CD quality from a CD original).
Anyway, back to humans. Of course there may be a few outliers who perceive above 20kHz, but it won’t be by much, and it will drop off dramatically with age. Which is fine. There is no particular harm in collecting music at bit depths and sample rates similar to studio master recordings, but let’s not assert this impacts playback positively without detailed and comprehensive ABX testing being cited.
Note: I have a bunch of 24 bit 92kHz stuff lying around. I could get it so I got it. For fun. After all, this is our hobby
... My niece who was at the time was around 15 came in the room, asking me to turn the TV off .. I looked at the screen and TV , saw nothing and shrugged , she insisted and proceeded to turn it off.. She could hear back in her room (a good 20~30 feet from the TV !!) the "screech" that flyback transformer produce ...These work at frequencies above 15 KHz. I was in the room , was not even close to being 50 years old and heard NOTHING... thus began my "descent" ) into the abyss of Science-based Audio reproduction ...
Nothing in the MP3 spec mandates a filter at any bit rate. A decent encoder will, however, apply a low-pass filter when the loss of (barely audible) high frequencies is deemed less bad than the increased distortion at lower frequencies that would necessarily result from using precious bits to encode aforementioned high-frequency content. This is all part of the psychoacoustic model specific to each encoder.They are only correct when they speak about 128kbs MP3
The 15kHz low-pass is present at 128kbs, the filter is higher in frequency at higher bitrates and variable depending on music contents, encoder settings and type of encoder.
It's stagnant because no one can pass a proper blind test. You could be the first:
You can use an ABX tool of your own choice. As long as it produces a log that can be shared with the rest of us.
