Either fit female crimp terminals to the wires on the bass box or strip back and solder
directly to the circuit board. The RED cable is the positive and should be connected to the +
terminal.
Take particular care if you choose to solder not to overheat the board. If you are unsure
about doing this we recommend the use of the simple crimp terminals.
Replace the amplifier module and reinstate the screws. We recommend reinstalling the
screws with a dab of glue on each, to prevent loosening with bass over time.