Zapco i-Force - Manual (Page 10)

10
Bass Boost Control
To provide more of the control you want with your system, we have
developed a unique wired remote gain control for i-FORCE amplifiers.
The i-Force remote is included with every i-Force amplifier and is
activated whenever the crossover is switched to low pass mode. The upper
limit of volume, for the remote, is controlled by the gain control on the amp
itself.
To set up for bass control, simply turn the remote fully clockwise, set
the amp gain for the maximum you want the bass volume to be, then turn
down the remote. You can now use the remote as your primary bass control.