My response to the video "Audio frequency range of LP vs. CD"

This is my response to the video at    • Audio frequency range of LP vs. CD   .
So...what happens if you take a vinyl record that was mastered on all digital equipment in 1985 with a known master recorder frequency response of 20 to 20,000kHz ([email protected] or 48kHz) and look at the frequency spectrum? You'll see it here. Remember, it is impossible for there to be frequencies above 20kHz on this due to the session and master recordings. Impossible, that is unless there is something being introduced to the playback.
While true that it is possible to have frequencies above 20kHz on a vinyl LP, most of the time, that's wasted noise that you can't hear. Vinyl - like the CD - was engineered for 20 to 20,000Hz and the RIAA curve ends at 20,000Hz. (There were exceptions for CD-4 quad LPs using a 45,000Hz carrier, but those were cut at 1/2 speed (or below) to make them work and rolled off the low end at 40Hz. Plus, they were recorded at a much lower level and were not durable.)