bass, lowshelf

Boost or cut the bass (lower) frequencies of the audio using a two-pole shelving filter with a response similar to that of a standard hi-fi's tone-controls. This is also known as shelving equalisation (EQ).

The filter accepts the following options:

'gain, g'

Give the gain at 0 Hz. Its useful range is about -20 (for a large cut) to +20 (for a large boost). Beware of clipping when using a positive gain.

'frequency, f'

Set the filter's central frequency and so can be used to extend or reduce the frequency range to be boosted or cut. The default value is 100 Hz.

'width_type, t'

Set method to specify band-width of filter.

'h'

Hz

'q'

Q-Factor

'o'

octave

's'

slope

'k'

kHz

'width, w'

Determine how steep is the filter's shelf transition.

'channels, c'

Specify which channels to filter, by default all available are filtered.

Commands

This filter supports the following commands:

'frequency, f'

Change bass frequency. Syntax for the command is : "frequency"

'width_type, t'

Change bass width_type. Syntax for the command is : "width_type"

'width, w'

Change bass width. Syntax for the command is : "width"

'gain, g'

Change bass gain. Syntax for the command is : "gain"