Bass and Treble




 * Accessed by: Effect > Bass and Treble...
 * [[image:BassTreble.png|Bass and Treble dialog]]

Bass (dB)
The amount of gain (amplification above 0 dB or attenuation below 0 dB) to bass (low) frequencies. Set this to a positive amount to boost the bass, or to a negative amount to reduce the bass. Bass gain is applied to frequencies lower than 1000 Hz, with the most gain being applied to frequencies about 100 Hz or lower.

Treble (dB)
The amount of gain (amplification above 0 dB or attenuation below 0 dB) to treble (high) frequencies. Set this to a positive amount to boost the treble, or to a negative amount to reduce the treble. Treble gain is applied to frequencies higher than 1000 Hz, with the most gain being applied to frequencies above 10000 Hz.

Level (dB)
If enabled by checking the checkbox (see below), this sets the final level or "volume" of the processed audio. This control therefore allows the final level to be reduced or increased so that it ends up at the requested level even if adjusting the bass and treble would have resulted in a different level.
 * Applying a boost to the bass or treble will tend to increase the overall level, especially when boosting the bass. As a result, the final level may be pushed so high that it distorts (clips). Therefore the level control has a maximum of 0 dB (as loud as the audio can be without clipping). If a value above 0 dB is entered, a warning displays to right of the enabling checkbox and the OK button grays out. To allow for less capable speakers or headphones, the level defaults to -1 dB.
 * Reducing the bass or treble may make the final level too quiet.

Enable level control
When checked (default), activates the "Level (dB)" control above. If this box is unchecked, the Level (dB) control is grayed out and its level setting will be ignored. If this box is unchecked and the Bass (dB) and Treble (dB) settings are on zero (no gain to be applied), "No change to apply." is displayed to right of the checkbox and the OK button is grayed out.

Technical details
Bass and Treble is a two-band Equalizer. 
 * The Bass control is a low-shelf filter with the half gain frequency at 250 Hz.
 * The Treble control is a high-shelf filter with the half gain frequency at 4000 Hz.
 * All controls have a gain range of +/- 15 dB.

Links
|< Index of Effects, Generators and Analyzers

|< Effect Menu