How to Hook Up 2 Amps with 1 Power Wire: 5 Simple Steps

If you’re wondering the way to hook up 2 amps with 1 power wire, you’re in the right place! In this article, we will provide a step-by-step guide to support you install and highlighting common mistakes to avoid during the process. So let’s get started!

The Way To Hook Up 2 Amps with 1 Power Wire: Step-by-Step Guide

Here we provide detailed information about tools to use and a step-by-step guide to help you connect 2 amps with 1 power wire:

Required tools and materials:

  • Two amplifiers
  • A power wire
  • Grounding wires
  • A distribution block
  • A wire cutter
  • Wire stripper
  • Heat shrink
  • Electrical tape

Step 1: Preparing the setup

To begin installing your car amps, it’s essential to prioritize safety. Start by disconnecting your car’s battery to prevent any electric current flowing through the wires while you work. Next, locate a suitable and easily accessible area in your car to install the amplifiers.

Step 2: Connecting the power wire

Now, you continute to connect the power wire and ensure that your amps receive a proper power supply. Well, start by attaching one end of the power wire to your car’s battery. It’s crucial to choose a wire that can handle the combined electrical load of both amplifiers without overheating or causing any problems.

Next, you’ll want to distribute the power equally to both amps. So, connect the other end of the power wire to a distribution block, which acts as a central hub. The distribution block divides the power from the battery and supplies it evenly to each amplifier. Additionally, to ensure a secure and safe power connection, you should check that all connections are tight and properly secured.

Distribution block

Step 3: Grounding the amps

In the next step, you will need to ground your amplifier. It makes sure your equipment works properly and keeps you safe. Additionally, grounding can prevent unexpected electric shocks or device short-circuits due to too much power.

Normally, each amplifier needs its ground wire. So, all you need to do is create a “grounding block”. This is a spot where all the ground wires from your amps join before connecting to your car’s metal frame. This connection is the last step of the grounding process. In detail, you can find a place on the car’s bare metal to attach your ground wires and try to keep the amplifiers less than 18 inches away from this spot.

Another key point to remember is that all the ground wires should be the same size as the power wires. This is because they have to manage the same amount of power. Additionally, every part of the circuit also needs the same size ground wire.

Step 4: Connecting the remote turn-on wire

Many sound amplifiers won’t turn on by themselves. Each time you start your music system (the head unit), so, you need a special signal to get the amplifier working.

To do this task, you need to have a certain wire that connects between the head unit and the amplifier. Normally, this wire has a blue color (often with a white stripe). It’s connected from the back of the head unit to the amplifier. But sometimes, the signal from the head unit is too weak to get the amplifier started, especially when you’re using two amplifiers at once.

A common solution is to include a signal booster, or transmitter, in the mix. This gadget takes the weak signal from the head unit and powers it up before sending it to the amplifiers.

To make everything work smoothly, you can also add a relay. A typical relay uses 12 volts and can be hooked up to the battery or main fuse box. Because this ensures it doesn’t take power from the head unit, preventing any power overload and keeping your equipment safe.

Connecting wiring to car amplifier

Step 5: Linking amplifiers to your car’s radio

Once your amplifiers are powered up, the next step is to connect them to the car’s radio or “head unit.” Essentially, this means attaching your amps to the ‘preamp outputs’ of your radio.

If your radio has many preamp outputs, this process becomes much simpler. You can directly connect your amps to these outputs, skipping the need for extra equipment or steps.

Sometimes, your amplifiers might have a function called “pass-through” capabilities. This function lets you connect the wiring of one amp to another, like a chain, and then attach it to your radio. This technique is especially helpful if your radio doesn’t have multiple preamp outputs.

But what if your radio doesn’t have many preamp outputs, and your amps don’t have pass-through capabilities? In such a case, you’ll need a piece of equipment known as a “Y adapter”. This handy little tool lets you join one plug to two devices.

For this situation, you’ll need a Y adapter that has a 1-male end and 2-female ends. 1-male end plugs into your radio and 2-female ends connect to your amplifiers.

When picking out a Y adapter, make sure to choose one that is well-made and durable, with thick wires that can withstand regular use. This will ensure a strong and reliable connection and reduce the chance of any issues in the future.

Car amplifier

Common mistakes and how to avoid them

When installing two amps with a single power wire might seem like an easy task, but you can face a few common mistakes: 

  • Choosing the wrong wire thickness: This is one of the common mistakes is using a wire that’s too thin for the amps. When using thin wire, this can cause it to get too hot, leading to short circuits.
  • Bad grounding: If your ground wire isn’t properly hooked to your car’s metal body, you could face problems like noise in your audio and poor sound quality. So, ensure your ground wire is tightly attached to a clean, bare piece of metal on your car.
  • Ignoring safety steps: Safety should always be your top priority. Don’t forget to unplug your car battery before you start working with any electrical parts in your car.


Understanding how to hook up 2 amps with 1 power wire can significantly improve your sound system’s performance. However, it’s essential to ensure proper connection and avoid common mistakes. Keep this guide handy, and you’re on your way to a great audio experience!


Can I ground two amplifiers at the same point?

Yes, of course. But remember, it’s important to check that the source is correctly set up for 30 amps. While the wire could take on more, the other items it’s connected to might not cope if they’re only designed for 30 amps.

Can you connect two amplifiers to one cable?

To connect multiple amps to a single power cable, the most effective way is to use a power distribution block. This device enables you to use a single cable for the majority of the connection route, including the critical segment that traverses the firewall. Subsequently, you can use shorter, individual cables to link each amp.

Is it possible to run an amplifier without RCA cables?

Yes, it is possible to set up an amplifier without relying on RCA cables. You would need to ensure that your factory-installed radio can accommodate speaker-level inputs or line-level connections. Additionally, it’s important to verify the RMS (Root Mean Square) power of the amplifier for a successful setup.