How to Power a Car Amplifier Using a Computer Power Supply

If you recently switched vehicles and have no room for that big subwoofer in your new car, don't give it or throw it away. Keep it. Use it inside or outside your house by having it powered by a computer power supply.

Steps

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    Find the power pin. In the power supply packaging (if bought new) there should be a pinout diagram. Look for the pin that says something along the lines of “Power on”, "PS OK" or other key words that indicates a on signal. It will be on the biggest pigtail.
    • 99% of the time it will be a green wire on new power supplies, but for older power supply “10+ years” the wire could be yellow or purple. If your power supply did not come with a pinout diagram, check the manufacturer website for a pinout diagram.
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    Cut the power wire from the pin and strip the end.
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    Cut the ground wire from the pin and strip the end. Refer to the pinout diagram to know which color is the ground wire. 99.9% of the time it will be the black wire.
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    Connect both striped ends using electrical tape or soldering iron or both.
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    Group all the 12v rails together by cutting them from their pins and stripping the ends. Refer to the Pinout diagram to know which color the 12v rails are. 99.9% of the time it will be the yellow wires.
    • Use electrical tape to bundle them together exposing their strip ends on one side. If using a soldering iron, solder all the ends together.
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    Group all the ground wires together (except the ground wire ) by cutting them from the pins and stripping the ends. Refer to the Pinout diagram to know which color the grounds are. 99.9% of the time it will be the black wires.
    • Use electrical tape to bundle them together exposing their strip ends on one side. If using a soldering iron, solder all the ends together.
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    Take the bundled yellow/12v wires and insert/attach it to the “+” source of the amp. Some amplifiers might just say “12v” instead of the “+”.
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    Take the bundled black wires and insert/attach it to the “-” source of the amplifier. Some amplifiers might just say “GROUND” instead of the “-”.
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    Use a discarded piece of wire to connect the “+” or “12v” to the “REM” or “REMOTE” source on the amplifier.
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    Plug in you power supply to the wall and it should power on. Enjoy!

Tips

  • You may add a switch in step 4. Just connect both ends of the wire into the switch. This will give you the option to switch off the power from a switch instead of having to unplug and plug the power supply.

Article Info

Categories: Cars