Impossible to know without a description of
your harness and where the amp is plugged in .
And which system you started out with.
Stock amps do not have much power and manufactures
try to cut corners on supplying power ,
Its more correct to use 4 gauge for power wiring weather
it makes a hear able difference might vary by how much you
slam it.
The issue has to do with basic electrical considerations power
vs wire size.
Better to have a fuse.
Amps should never be wired in Series for Power.
https://www.google.com/search?client...ar+stereo+amps