How to Use Factory Amp with Aftermarket Stereo?

Factory speakers are made to sound better with a factory amp. But is it wise to pair an aftermarket speaker with a factory amplifier? Does it provide excellent music? Don’t be concerned; we are here to dispel all of your ambiguities and provide information on how to use a factory amp with an aftermarket stereo?

Many audiophiles believe that factory amps don’t work in your favor when you replace the stereo or stock speakers. However, you can accomplish your goals if you know how to use a factory amp with aftermarket stereo?

What are aftermarket stereo and its features?

The aftermarket unit is a stereo or audio system not pre-installed in a car at the time of manufacture or dealership. To provide you with more functions, it must instead fit into your car.

Compared to the audio system in a factory head unit, the speakers in an aftermarket audio system are of very high quality. The audio quality is excellent or crystal clear.

An audio track with additional features has varying tone variations with fading features or imbalances. These audio tracks are also prominent, and the speaker system does not affect the audio.

Additionally, you may turn up the level without worrying that you’ll ruin your speakers or hear distorted audio. With an aftermarket audio system, you can experience surround sound features or sound like a live concert, depending on the music type.

The amplifier is robust and will correctly tune the audio’s bass and treble components. The amplifier for the speakers won’t be harmed by high voltage electricity.

Methods to Use Factory Amp:

Here we share some methods for using a factory amp with an aftermarket stereo.

1. Retaining Factory amp – Maintaining the factory amp typically simplifies installing a new stereo, and in certain vehicles, that may be your only choice. The sound of your new stereo is only as good as that amp.

2. Bypassing factory amp – Because you must run the bypass harness to the factory amp, frequently placed in another area of the automobile, bypassing the factory amp requires more effort. Even if you keep the factory speakers, it’s typically worth the extra work because your new stereo will sound better.

Brought the low end lacking on the initial run back by bypassing the stock amp. The midrange and high frequencies were much more genuine without sacrificing detail. It made a significant difference. The bypass is on!

3. Change Frequency Setting – Factory frequency settings may also be present in factory amps. Power alone is not the only factor. A filter or crossover network for particular frequencies that might not sound their best with a new system might also be included in the stock amp. Bypassing the factory amplifier and transferring the JVC receiver’s power straight to the speakers, we could transmit a clear, full-range signal while bypassing any factory amp filters.

What is a factory amp bypass, and why is it needed?

A factory amplifier bypass essentially deactivates your vehicle’s factory amplifier or its capabilities.

You’re attempting to stream audio directly from your radio to your speakers without any amplification. Remember that the amplifier is located between your speakers and the system.

A factory amplifier could need to be bypassed for a few different reasons. The most frequent problems involve a factory amplifier that isn’t providing enough quality, isn’t working correctly, or—our favorite—a speaker that has blown and is nearly impossible to replace.

Also, read to know –  How to bypass factory amp without a harness 

Frequently Asked Questions

Where can I find my factory amplifier?

The factory amplifier is situated on the passenger side under the back seat.

Are there factory amps in every car?

However, every automobile stereo system needs an amp, a low-powered, built-in component, or a separate, high-powered unit. In fact, without one, a car stereo wouldn’t function. Most vehicles’ audio systems and straightforward upgrades don’t come with a separate amp. However, many do have one specifically designed to power a subwoofer.

Will an aftermarket stereo sound better?

Aftermarket audio systems can help with that. An aftermarket car radio can be louder than the typical factory system. It can give clearer, toned, and more detailed music thanks to higher-quality power and superior circuit designs.

How do you know if your factory amp is blown?

  • The sound has a discernible distortion.
  • Even though your audio system is turned on, there is no sound.
  • Your stereo system starts emitting strange noises, like farts. 

Why would you bypass a built-in amplifier?

The music sounds more precise and detailed after bypassing the stock amplifier than before he used the amplifier integration harness. To get better sound, we advise bypassing the factory amp whenever one is available. If you’re considering getting a new car stereo, you should keep this choice in mind.


The only concern of music enthusiasts is the excellent sound system. And to achieve perfection, many people prefer aftermarket stereo systems. But they are also worried about whether it works with factory amp or not? This article shares methods for using factory amp with aftermarket stereo to get better music.

Before replacing all the wires, make sure everything is functioning correctly. The new sound system makes his family’s carpooling a lot more enjoyable. The music sounds more accurate and finely detailed when bypassing the factory amplifier than when the amplifier integration harness is used. To get better sound, we advise bypassing the factory amp whenever one is available.

And for more information related to amps and subwoofers, read our related articles. 

Also, check out the 10 best budget mono amplifiers.

1 thought on “How to Use Factory Amp with Aftermarket Stereo?”

  1. Where is the article you speak of to retain the original amplifier, 1997 Lincoln Town Car with JBL system ? Crutchfield says I can’t keep the factory amp with their aftermarket CD Players, but all the articles I’ve read say that leaving the factory amp installed is not only possible, but an easier installation ! What’ the real deal ?


Leave a Comment