If you have a subwoofer, it’s important to know how to connect it to your stereo system. If you don’t, you may not get the full performance you expect.

Before going to the procedure of “How to connect subwoofer to amplifier” here are some precautions to keep in mind before installing your car subwoofer.


First, make sure that the subwoofer you purchase is compatible with your amplifier and speakers. This means that the subwoofer must be wired to match your existing wiring system.

Second, make sure the subwoofer has adequate volume controls. Make sure the volume control on your amplifier is set to high enough for the level of bass you want to produce.

Third, the subwoofer should be able to handle the power required by its own speakers. Most amplifiers are rated at 15 watts per channel or less. If your subwoofer requires more than this, it’s probably not a good choice. Fourth, the subwoofer should be mounted securely.

Fourth and foremost, safety. Subwoofers produce a lot of energy in the form of sound (typically anywhere from 100 watts to several thousand). If not properly installed, they can damage your hearing and/or blow out your speakers or tweeters. So before we get started, you need to make sure that whatever you are doing, you’re doing it safely.

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Be aware of the wiring going to and from your subwoofer. Most cars have a window between 10 – 14 volts on most stock wiring systems. I can’t tell you how many times I see someone hack up their car’s wiring harness to make it fit a subwoofer. Make sure you know what kind of power your speaker needs and make sure you’re not going to fry anything by wiring it up wrong.

Be aware of the RMS (Root Mean Square) power handling ratings of the woofer and amplifier that you’re using. Just because an audio store salesperson tries to sell you an amplifier that puts out 1500 watts doesn’t mean you should use it to power a 150-watt subwoofer. The reason I mention this is because speakers are made for certain power requirements, if connected to more than what they’re rated for, they can burn out or catch on fire!


You’ve got the subwoofer and amplifier, now you just need to hook it up. This article will give you step-by-step instructions on how to connect your subwoofer using a four-channel amp.

Get out your equipment and set them up near the installation location of the subwoofer box. The process is relatively simple and straightforward.

  1. Take the RCA cables and plug them into the Lower Outputs on your amplifier (Output 1, 2, 3 or 4 – it doesn’t matter which). Then take the other ends of the RCA cables and connect them to your aftermarket Head Unit in a similar manner.

  2. Connect the Remote wire from your Head Unit to the Remote Output on your amplifier. Usually, the remote wire is a different color RCA cable and will be labeled REM or REMOTE. If it doesn’t have a label then use any color that isn’t being used for output.

  3. Connect the power cables from the battery to the amplifier. It doesn’t matter which cable goes into which post on the amplifier. The positive cable should be RED while the negative should be BLACK.

  4. Once everything is connected, take your Speaker Wires and connect one end of each wire to each speaker in your aftermarket system. If you are not using a crossover or equalizer, you will connect the subwoofer speaker wire to the positive and negative post on the amplifier. If you are using a crossover or equalizer, make sure it is connected properly to your Head Unit (there should be two inputs for this type of connection).

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  1. Turn on your aftermarket head unit – You should hear a tone from your subwoofer – this is the Low Pass Crossover – set it to about 80 Hz – 100 Hz. Turn up the volume completely and play a song with low bass – turn down the output of your amplifier until you cannot hear the subwoofer anymore or there’s no sound coming from it at all.

Congratulations! You’ve just installed your subwoofer system! And we have solved your answer “How to connect subwoofer to amplifier”. Now you can enjoy the deep bass that comes from adding a subwoofer to any audio system.

Remember, always be safe when working with electricity and use common sense. If you have questions or are unsure of something – ask someone qualified to help you out. And as always, enjoy your music!

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