That part of the spectrum is not intended to be there in the original recording, it comes as a result of the resonance. Ground shakes and the gramophone rumbles. LP is not perfectly flat and the needle picks up the subsonic sound.
In this tutorial we are gong to see how to remove the unnecessary part of sound that is eating up the file and eating up electricity when sending the low frequency signal to the speakers.
Filtering out the resonance and rumble
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7zrMMpKjBjMYNoz_E1jswrBDYRFsYh6W7Z3wlwVfLONf-jEJVwFa6sSDgDyMtzlEyLSHUL-4COQJjb7XWZMWg9mEEGoWJYaBYYrRRi_A-VeI2YBaNYIjXg3LJiSfNXU8Iq430FKdkQqBK/s1600/freq2.jpg)
Our recording has picked up loud signal around 20 Hz and below.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhmMl747XA5UxYdHB3-YdmSdCBDmZRUJpj6Lx5nWq6KiaTetzUMUHo5lzBA-hxXdebntLeijoa_aC2Q6UNaVBlQiRopnyBAZZM0mp00jn5NazczR2uTKPbcHM5Oyj2dJ0UnhIoMN8KibvGO/s1600/filter2.jpg)
Supposing there's no instrument playing at 35 Hz, we filter that out.
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