There's no good reason to feel that way. 20KHz can't in fact be "readily" perceived. There are almost no musical harmonics in the top few thousand of Hz and the normal loss of sensitivity of the human ear at higher frequencies(e.g., the Fletcher&Munson curves)makes them of largely only academic significance at normal listening levels. For example, when the upper limit for FM broadcasting was studied, the result was that it was set at 15KHz, since a higher limit had been found to be of no audible significance.

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Enjoy the music, not the equipment.