The Markbass MoMark EQ42S Bass Amp Module is designed to fit inside the MoMark housing as a component. The MoMark EQ42S Bass Amp Module features 4 bands of equalization and 2 semi-parametric controls which allow you to choose the frequencies in the mid-low and mid-high range that you want to boost or cut. These controls compensate for bad venue acoustics, optimize your place in the mix with the other instruments, or reduce feedback from acoustic instruments like the double bass. The frequencies that you can cut or boost have been carefully selected to be practical, and all tweaks are audible—only small adjustments are needed to control punch, attack, and definition to suit your personal needs and tastes.