Bass Frequency Response
WARNING: This page is about a different car, the 2004 Chevrolet Monte Carlo and 2004 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
The Bass Frequency Response item does not contain a submenu. This setting is used to reduce the bass output of the radio.
To set, select Bass Frequency Response under the Special Functions and follow the menu.