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A high-pass filter (HPF) is an electronic filter that passes signals with a frequency higher than a certain cutoff frequency and attenuates signals with frequencies lower than the cutoff frequency. It is sometimes called a low-cut filter or bass-cut filter in the context of audio engineering. High-pass filters have many uses, such as blocking DC from circuitry sensitive to non-zero average voltages or radiofrequency devices. 

A high-pass filter is being used by DJs at FM BELOWGROUND to bring you the best possible sound system and experience.
Image source: Yetiout