All about subwoofers

Vehicle-specific enclosures with subs

Instead of the usual "sub-in-a-box," you might want to consider a vehicle-specific enclosure. Made to fit your car or truck, this enclosure contains a high-quality sub and fits into a convenient spot in your vehicle. Some enclosures even include a built-in amp, for the ultimate in stealth bass. You don't lose much (if any) space, the sub is perfectly matched to its enclosure, and it has a factory look that won't alert potential thieves to your expensive sound system. To see if there's a vehicle-specific enclosure for your car or truck, visit our vehicle selector.

Amp power wire kits

It is absolutely essential for an amplifier to receive its full share of electricity through large power wires, in order to operate properly and safely. The wattage of the amplifier determines what the proper size power wires should be. Amplifier manufacturers usually recommend a particular power cable size for each of their amps. Or, you can use our Cable Gauge Chart to figure out the power cable size that's best for your system.

Amp wiring kits contain most of what you need to hook up your amp. Some kits even come with signal wires, the RCA patch cords that allow the signal to get from the receiver to the sub amp.

Fuses are for your safety

Always install the in-line power fuse near the battery. If something failed back by the amp, you don't want a live, high current wire stretched throughout your car and engine compartment, because it could possibly heat up and start a fire.

The signal wires

The music has to have a way to get from the receiver to your sub amp. If you have an aftermarket receiver, it probably has RCA outputs you can use. Plan on getting new, high-quality patch cables. If you have a receiver with no RCA outputs, you can tap into the existing factory speaker wires with new speaker wires, to use for a high-level input to your amp. The amp, of course, has to have a speaker-level input feature for this to work. To prevent noise, all signal wires should run through your vehicle as far away from any power cables as possible.

The speaker wires

If your sub system is going to put out more than 1,000 watts RMS, you can use 12-gauge speaker wire. But 16-gauge speaker wire works well for most installations. Take a hint and order twice as much as you think you need. You never know when a sub or amp's position will need adjusting and you'll be thankful you have the extra length.

And don't forget tools

There are some tools and connectors that will make your sub installation much easier. Take a look at what you might need in our video on Car Stereo Installation Tools.

Gather the gear

Before you start working, make sure you have everything you need. You'll want to gather your component sub(s), enclosure, speaker wire, amplifier, (or a powered sub), an amp wiring kit, signal cables, and any tools you think will come in handy.

Now is the time to install it

To see how an amp installation is done, see our Amplifier Installation Guide, and watch our video on Installing a Car Amplifier. You can also check out the Subwoofer Installation Guide for more tips and suggestions.

Make sure you always disconnect the car battery's negative, ground cable before working on the electrical system. Also, make sure the fuse is out of the in-line fuse holder until the installation is complete. Only then should you re-connect the battery ground and install the fuse.

Test — does it turn on and off correctly?

Make sure all volumes and gains are set to their minimum, and make sure all filters are off or disengaged. The sub amp should come on when you turn on the receiver. If the amp stays on even after you turn off the ignition, then you need to go back and re-wire the remote turn-on lead correctly to a switched power source. An amp that's always on will drain your car's battery in a hurry.

Tune your sub

Properly setting the gain and the filters of your sub amp is crucial to getting good bass without causing damage. See Tuning Your Subs for the "by ear" method of tuning your system. Another method involves using test tones and a multimeter to set the amp's gain to a target output voltage. Our Test Tones article helps explain that.

A lot of people notice changes in a new subwoofer's tone after a few months of play. Whether this "breaking in" period really effects the sub or not, a second tuning, a few months after the first, will make your ears happy.

Don't blow it

There are two ways to blow a sub. The first way is to over-power it: constantly playing music at a power level well beyond what the voice coil can stand. Eventually, it burns up.

The other method of blowing a sub doesn't involve power, but distortion, often called "clipping." That crumbling, crackling, gritty, or hissing sound can destroy a subwoofer no matter what the volume. There're a couple reasons why. One is that during the flat parts of a clipped signal, although plenty of current flows through the voice coil, there's no movement, and hence no cooling. When that happens, the coil overheats.

Another reason is that severely clipped waveforms force the sub's coil and cone to try to move at infinite speed when changing direction. That can't happen, and either the cone or the coil dies. Under-powering is often the contributing factor in a blown sub because a distorted signal gets applied in an attempt to get more volume.

Don't stress your vehicle's electrical system

Capacitors should only be used if your lights dim a little on hard bass hits. For more information, see Capacitors FAQ. If your lights dim a lot whenever the music plays, then your sound system is overwhelming your vehicle's electrical system, and could damage the battery and alternator. Refer to the article entitled Car Lights Dim When the Music Plays for some suggestions on how to solve that problem.

Rock on, but be cool

If your car stereo can be heard a block away, that's impressive -- but it might not make the best first impression. Enjoy your music, and share it with those who'll appreciate it, but don't infringe on someone else's right to peace and quiet.

Speaking of sharing, send us some photos of your finished installation. Our Custom Car Showroom is a great place to show off your system, or find inspiration for your next car audio project.