To set the equaliser manually

Select Menu > Media > Music.
Browse by category using the navigation key.
Scroll to a title and select Play.
Select Options > Settings > Equaliser.
Make sure you are in Manual view. If you are not, select Manual.
To scroll between the frequency bands, press the navigation key right or left.
To change the value for a selected frequency band, press the navigation key upwards or downwards.
To go back to the player view, select Done.