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Step 1
Decide whether you want a mono, two channel or four channel amplifier. What you choose will depend on how many speakers you want to power and whether or not you have a subwoofer. Think about what would be best for the music that you want to play in your car.
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Step 2
Find the right match for your car's speaker system. Ensure that the RMS and Peak power ratings of the amp match your car's speakers, otherwise you can damage your speakers.
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Step 3
Search for the used car amp you want to buy. Check online at auction websites, pawn shops and newspaper classified ads. A lot of auction websites give you the option to do a search for models and price ranges.
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Step 4
Research the seller before buying. If you don't feel comfortable with the seller, don't buy from him. It will save you a lot of time and money if you research before you buy.
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Step 5
Get proof that the used car amp works if you will purchase it from a private party. If you are buying online and are unable to get proof, find out if the website offers a buyer protection plan that will allow you to return the item for a refund if it doesn't work.













