Illustration of a car audio system with two amplifiers connected using a single power wire.

How to Hook Up Two Amps with One Power Wire: A Comprehensive Guide

3 minutes, 40 seconds Read

Learn how to hook up two amps with one power wire in your car’s audio system for optimal performance. Follow this comprehensive guide to understand the power requirements, choose the right wire, and complete the step-by-step wiring process. Enhance your sound experience while prioritizing safety.

How to Hook Up Two Amps with One Power Wire

Enhancing your car’s audio system with multiple amplifiers can elevate your sound experience to a whole new level. However, effectively connecting two amps with a single power wire requires careful planning and execution. In this guide, we will provide step-by-step instructions on how to hook up two amps with one power wire while ensuring optimal performance and safety.

Understanding the Power Requirements

Determining the Gauge of the Power Wire

Before diving into the installation process, it’s crucial to understand the power requirements of your amplifiers. Consider factors such as RMS power, peak power, and impedance to determine the appropriate gauge of wire for your setup. Using an insufficient gauge wire can lead to voltage drops, affecting the performance of your amps. Consult the manufacturer’s specifications or seek expert advice to ensure you select the right gauge.

Choosing the Right Power Wire

Factors to Consider

Selecting the correct gauge power wire is essential for proper current flow to both amplifiers. Here are some factors to consider when choosing the right power wire:

Power Rating:

 Determine the total power rating of both amplifiers to ensure the wire can handle the combined load. Add the RMS power of each amplifier to get an accurate estimation.

Wire Length:

 Consider the distance between the battery and the amplifiers. Longer wire lengths require thicker gauges to minimize power loss.

Amplifier Placement:

 If the amplifiers are located far apart, you may need to run separate power wires to each amplifier. However, if they are close together, a single power wire can be used.

Wiring the Amplifiers

Step-by-Step Process

Follow these steps to effectively wire your amplifiers, including how to wire high level input on an amp:

Disconnect the Power: 

Before starting any wiring work, disconnect the negative terminal of your vehicle’s battery to ensure safety.

Determine Wire Routing:

 Plan the routing path for the power wire, ensuring it is away from sources of heat or potential damage. Avoid sharp edges or areas with high foot traffic.

Install Distribution Block:

 If using a single power wire, install a distribution block to split the power between the two amplifiers. The distribution block should match the gauge of your power wire.

Connect Power Wire: 

Connect the power wire to the positive terminal of your vehicle’s battery. Use appropriate connectors and ensure a secure connection.


 Each amplifier requires a dedicated ground connection. Find suitable grounding points near the amplifiers, ensuring a clean metal-to-metal connection.

RCA Interconnects: 

Connect the RCA cables from your head unit to the appropriate inputs on each amplifier. Ensure a snug connection to avoid signal interference.

Remote Turn-On Wire: 

Connect the remote turn-on wire from your head unit to the remote terminal on both amplifiers. This wire will activate the amplifiers when the head unit is turned on.

High-Level Input Wiring: 

If your head unit does not have RCA outputs, you can still connect the amplifiers using high-level inputs. To do this, identify the speaker wires that correspond to the head unit’s channels and connect them to the high-level input terminals on each amplifier. Refer to the amplifiers’ manual for specific instructions on wiring high-level inputs.

Double-Check Connections:

 Before restoring power, double-check all connections for accuracy and tightness. Any loose connections can lead to poor performance or electrical issues.

Troubleshooting and Safety Tips

Fuse Protection: 

Install appropriate fuses near the battery and distribution block to protect your amplifiers and wiring from electrical faults.

Testing the Setup:

 After completing the installation, test your audio system to ensure both amplifiers are functioning correctly. Fine-tune the settings and monitor for any abnormal behavior.

Professional Assistance:

 If you are unsure or uncomfortable with the installation process, it is advisable to seek professional help to avoid any potential damage or safety hazards.


Hooking up two amps with one power wire can be a rewarding upgrade to your car’s audio system. By understanding the power requirements, selecting the right wire, and following a step-by-step wiring process, you can achieve optimal performance without compromising safety. Enjoy your enhanced sound experience with confidence, knowing that you have successfully connected multiple amplifiers in your setup.


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