How to Install Speakers and Amp to a Car

How to Install Speakers and Amp to a Car

Installing amplifiers to cars is one way of optimizing your car’s audio system. It enhances the sound and frequency you listen to. Most of the cars with audio systems have a built-in amplifier. Every sound system needs one to have it work, though its work is not that good. Built-in car amps are usually not that strong enough to support your car’s sound system. That’s why it is essential to have your amplifier support your audio to have clarity and can give power to the sound of your audio signals.

Things to Consider and Do

In getting your car modified with an amplifier, there are things you need to consider and do. Like you need your installation accessories, where do you want to put your amplifiers and your wirings. When you already decided what to do, prepare the things you will need.

  • Wires (power and ground)
  • Fuse
  • Amp wiring kit (usual amps come with a complete set of wirings)
  • Speaker wires and RCA Wires

Your Amps Location

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In finding a good location for your amps, you can check the amp’s manufacturers’ guide in which place to have. Make sure your amp is at least three feet away from your radio or stereo. Thus, this is to avoid noise radiation from the car’s electrical wirings and radio signals. Your amp needs space to keep it cool at all times. There are suggested locations for your amp’s location like:

  • At the firewall (passenger’s side) – only short wirings can be used and no need to jump over or removing seats. Though it can catch noise and only small amps can fit in this location,
  • At the trunk – this is an excellent location, and it has plenty of space in which air can circulate and can avoid overheating your amp. However, it can consume some space for your things. 
  • It can be under a seat – also a good location, only short wirings, and patches can be used. It is near to your rear speakers, and no luggage space is sacrificed. It needs, however, to have your seats removed and have the tendency to disarm your airbags when removing seats. Only small amps can fit in this suggested location.

What to Do

First things first, you need to turn off your car’s power – removing the negative terminal of your car’s battery. Then, if you have already chosen your location, mark it for your amp mounting holes. Make sure your location is free of space where air can circulate, and it must not be vertically positioned to your speakers. Drill the marked holes using a drill bit at about an eighth of an inch or .32 cm smaller in diameter than the amp’s mounting screws. Then, screw the amp using the screws from the amp kit.

Next Step: Removing Covers and Wiring Connections

Using the pry tool, remove the covers of interior trim along the floor, and take the radio out from the dashboard. Drill a hole on your firewall, make sure it is on the same side with your battery. Thus, this is where you will going to slip through your red power cord down to the battery. Don’t connect the wires to your battery first; leave it there next to the battery for now. Then, have your remote wire (thin blue wire from your kit) slip behind the stereo head down to the power cord. Line the power wire and the remote wire so that they can run together. 

Tuck the power line and the remote wire down the floor (the one you opened the cover with the pry tool). Secure them well using a zip tie. Then, have your RCA cable run through the dashboard and behind the stereo head. Hence, leaving the other ends peeking down the footrest and the other from the stereo head. 

Connecting the Speakers and Wiring the AMP’

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Next is to wire the speaker wires to the speakers; each speaker has its speaker wire. So the number of wires you will need depends on how many speakers you want to have connected it with the amp. In wiring, the amp, strip half of an inch in every wire you will be going to connect. Then, insert the power wire to the 12v input on the amp and secure the ground cable to the ground port. The blue wire to the remote input on the amp. Plug-in the RCA cords to the amp (it is the red and white input), then plug-in as well your speaker wires to the amp

When all wires are connected to your amp, don’t forget the other end of the ground wire. Make sure to connect it to a bolt near your amp. Secure it properly by removing the paint around the hole of the bolt and the bolt. Then, insert the ground wire and place the bolt back tightly. Using a butt connector in securing the remote wire to the amp turn-on wire, and should be plugged into the stereo. Then, plug in the RCA wires with the matching ports behind the stereo. 

In your amp installation kit, it includes a 30-amp in-line fuse and a fuse holder. Have this in-line fuse attached by the power cord at the other end located inside the engine bay of your car. Secure the connection with a screw, then crimp a ring terminal at the other end of the power cord. That will be going to connect at the positive side of the battery.


When everything is wired already and connected, reconnect the negative side of the battery. Turn on the amp (amp sensitivity or the gain on) as far as it can go to test the audio interference. In identifying the sound interference, have music familiar to you be played. Hence, this way, you can easily identify the sound interference. Turn the sound on as loud as you can hear distortion so that you can easily adjust and control the sound. If you already had done with the controls and adjustments, reattach the stereo and the trim pieces into position. 

Installing a car amp to enhance your car’s audio system may take time from attaching the wires to mounting the device. After all, it pays it off, all the hard work, when you place everything in a success.

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