Bypass OEM Amplifier - Help Scout

Bypassing the factory amplifier is a more difficult undertaking but provides the best sound quality gain. When bypassing, it takes a more work because you have to run the bypass harness to the factory amplifier, which is often located in some other part of the car. Bypassing the factory amplifier will require an aftermarket amplifier or using the aftermarket radio's internal amplifier.
Tune your car stereo system to suit your needs or correct your vehicles natural acoustic problems with an equalizer also known as an EQ. Adjust individual bands or range of bands with a parametric equalizer and tailor your systems frequency response to your ears.

Equalizers are multi-channel sound enhancement devices, designed to input sound outputted from audio sources such as receivers; and seamlessly filter/bypass and send (return) that audio source (output) to the same or other audio peripherals.