(17-09-2021 20:26)VNV73 писал(а):  Ну, раз коллега freesound стесняется назвать аппаратное устройство системы(включив программу "Морозко"), которое не даёт нам услышать ниже 20Гц, я ему помогу.
Вот беру свой усилитель и смотрю спецификации:

Можу тільки поспівчувати

"Rumble filters are high-pass filters applied to the removal of unwanted sounds near to the lower end of the audible range or below. For example, noises (e.g., footsteps, or motor noises from record players and tape decks) may be removed because they are undesired or may overload the RIAA equalization circuit of the preamp.[1]

High-pass filters are also used for AC coupling at the inputs of many audio power amplifiers, for preventing the amplification of DC currents which may harm the amplifier, rob the amplifier of headroom, and generate waste heat at the loudspeakers voice coil."
https://en.wikipedia.org/wiki/High-pass_filter