The Bass, Treble and Echo buttons/dials on the control panel on top of the Partybox only applies these effects to the Microphone for Karaoke use.

These effects are not applied to other sources or inputs such as Bluetooth, Aux or USB, the Equalizer must be used in the JBL Partybox app for this (on supported models).

Also, if more bass is desired, there is a Bass Boost button on the top control panel (with 2 levels of Bass Boost: Off, Level 1 & Level 2, switched through pressing the button multiple times). This will be applied to the sources and inputs mentioned above (but not the microphone).