Hogtunes NCA 450U KIT-AA : 4 Channel Amp / Speakers (1998 - 2013 - model years) - Manual (Page 6)

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Step #3: Once you are confident the wires are correctly attached to the rear
speakers, sit them in place, put the grills back on and secure the
speakers by reinstalling the 4 screws on each grill. Attach the amps red
wire to the positive (+) battery terminal and the amps black wire to the
negative (—) battery terminal. The factory battery wires are also
re-installed at this point. When attaching the power and ground wires,
it is always a good practice to do the negative first. When the positive
connector touches the battery, some sparking is normal. This is a
function of the capacitors in the amplifier charging up.
Step #4: Turn the stereo on, and at low volume, test to make sure all 4 speakers
are working. Make sure the radios fader control is adjusting the volume
between front and rear speakers. If not, double check the “Fader/ No
Fader” switch.
Re-install the seat making sure the amplifiers “+” and “—” connectors
are positioned in such away so they will not bend or break when the
riders weight is on the seat. This is the best time to take a few minutes to
“clean up” the wiring and secure using supplied zip-ties.
Before re-installing outer fairing, turn front wheel
to each extreme side making sure any wiring is
not impeding the steering of the motorcycle.
Failure to do so can result in serious
injury or death!
Adjusting the Bass and Treble: The way the system sounds sitting still or at a
stop light will be RADICALLY different from how it sounds “at speed”. Your
able to use the radios controls to adjust the sound, but please do so carefully
when riding.
Re-install the fairing and your system is now ready to enjoy!