passive subwoofer


Everyone who loves music or audio knows how important a subwoofer is to a sound system because of how well they reproduce low-frequency sounds.

It’s difficult to buy a subwoofer because there are passive and active subwoofers available, and passive subwoofers need an extra amplifier. Therefore, it will be your responsibility to carefully select the ideal amp for your subwoofer.

This article will go into greater detail on the need for an amplifier for subwoofers, the distinction between powered and passive subwoofers, and other topics. Whether an amplifier is required for a subwoofer, we’ve got you covered.

What Does An Amp Do?


An amplifier is an important component of any audio system, whether it be in a car, boat, home, or RV. It takes a weaker signal and amplifies it into something that is louder and clearer. Think of a megaphone; the input is your voice, the amplifier is the microphone plus power, and the output is the speaker.

The same concept applies to an amplifier in a car or boat; it takes a weaker signal and amplifies it into something that can be used for speakers or subwoofers.

An amplifier works by increasing the voltage of an audio signal so that it can be heard more clearly through speakers. It also increases the power of the signal so that it can drive larger speakers at higher volumes without distortion.

Amplifiers come in many different shapes and sizes depending on their purpose; some are designed to power large subwoofers while others are designed to provide clear sound for smaller speakers. No matter what type of audio system you have, an amplifier will help you get better sound quality from your speakers.

Does A Subwoofer Need An Amplifier?

A Subwoofer Need An Amplifier

A subwoofer is an essential part of any quality sound setup. It adds an extra blast to your music and makes action movies and video games come alive. When considering whether a subwoofer needs an amp, it depends on the type of subwoofer you have. If you own a premium-powered subwoofer, you may not need an external amplifier unless you want to push the output to extreme levels. However, a passive subwoofer cannot work without an amp as it does not have its own power source.

When deciding if a subwoofer needs an amp, consider what type of sound system you are trying to create. If you are looking for more bass or want to really feel the action in movies and games, then adding an amplifier will help increase the power of your subwoofer and give it more punch.

On the other hand, if you just want some extra bass but don’t need anything too powerful, then a powered subwoofer should be enough for your needs. Ultimately, it comes down to personal preference and what kind of sound system you are trying to create.

Subwoofers are designed to reproduce low-frequency sounds, which require a lot of power. In sound systems where the subwoofer is part of the setup, it is usually optimized to work with the rest of the system without any distortions due to inadequate power. However, when using a standalone subwoofer, there is always the risk that it will be too powerful for the sound system’s receiver and other components. This can lead to labored-sounding bass that lacks depth and clarity.

To prevent this from happening, passive subwoofers need an external amplifier in order to function properly. An amplifier provides additional power so that the subwoofer can deliver deep and clear bass without any distortion or strain on the other components. Powered or active subwoofers do not require an external amp as they already have their own built-in amplifiers. However, these types of subwoofers tend to be more expensive than their passive counterparts and may not offer as much flexibility in terms of customization options.

Active vs Passive Subwoofers For Amplifier

passive vs active subwoofer

Due to the built-in AMP, active or powered subwoofers are potentially quicker to set up, but they are typically more expensive. They allegedly perform better by producing bass that is both deeper and more powerful. This is possible because the subwoofer and internal amplifier are almost a perfect match. Because of this, active subwoofers continue to be the preferred choice.

Despite being less expensive than powered subwoofers, passive subwoofers are more complicated to set up because of the additional components required. The ability to link numerous passive subwoofers together makes them better suited for home entertainment setups because they are more customizable.

What is better depends largely on your needs because they are both good in their own way. While passive subwoofers are less expensive and offer more customization, active subwoofers are more expensive and deliver deeper bass.

How To Choose The Right Amplifier

This is mostly intended for people choosing passive subwoofers. As we’ve shown, if you purchase a passive subwoofer, an external amplifier is required. However, choosing an amplifier that precisely matches the specs of your passive subwoofer can be challenging.

It’s recommended to use an AMP with adequate power to handle the subwoofer you’re powering. Despite the fact that this is quite clear, it is advisable to choose an AMP with extra headroom. As a result, the AMP will be operating at less than its maximum efficiency, which leads to cooler operating temperatures and frequently produces a cleaner sound.

Generally, you should strive to offer at least twice the uninterruptible power rating that the designer of your subwoofer suggests. Just be careful not to go for under or over-powering your subwoofer since this might result in wave distortions and signal clipping, which will ruin your subwoofer. The main reason for this is when you try to magnify a signal but it starts to square off at the top and bottom of the wave.

How To Connect A Subwoofer To An Amplifier?

amplifier and subwoofer

Connecting a subwoofer to an amplifier is a relatively simple process, but it does require some preparation. First, you’ll need an RCA cable to connect the subwoofer to the amplifier. This cable will carry the low-frequency audio signals from the amplifier to the subwoofer. You may also want to get some speaker wires if you plan on adding speakers as well. Once you have all of your cables and wires ready, you can begin connecting your subwoofer and amplifier.

Finding the best position for your subwoofer should be your first step in this procedure. It won’t need as much directional push as a speaker because it is mostly transmitting low-frequency sounds.

Finding a spot that will allow you to adequately conceal the connection is necessary because the process will include cables and wires. It’s always a good idea to keep it close to your TV and other electronic devices.

Start by disconnecting the amplifier and subwoofer from the power supply and turning them off. Connect the RCA cords to both of them after they have all been turned off. Simply attach the amplifier input to the subwoofer output. In some instances, the amplifier’s jack will be labeled as a subwoofer output. At this point, your subwoofer is ready to use.

After that, you may test your connection by turning on your amplifier and subwoofer.

Is An AMP Required For A Car Subwoofer?

To explain it more clearly, all speakers, regardless of the type you are using, need an amplifier to function. Amplifiers are typically incorporated into cars, and depending on their specifications, you might be able to use them to power your car’s subwoofer. If not, you can typically add an external AMP to your car’s sound system to upgrade it. You may locate a few respectable brands of car amplifiers on the market today if you’re looking for them.

Frequently Asked Questions

car subwoofer

What differentiates passive subwoofers from active subwoofers?

An active subwoofer and a passive subwoofer differ in their power source. Because the power source is built into the box, the active sub is also known as a powered subwoofer. This will make installing your car audio much easier.

What advantages does a car stereo external amplifier offer?

A car stereo’s external amplifier is quite effective. The car subwoofer will give the automobile audio system distortion-free sound. Without an amplifier, the output from regular speakers and a subwoofer won’t typically be louder and the bass frequencies won’t be as pronounced.

Which is preferable, one or two subwoofers?

When it comes to subwoofers, more is usually better. Furthermore, size matters. Although not everyone has enough room, you should add multiple subwoofers if you can.

Are subwoofers harmful to your vehicle?

A strong car subwoofer can only deplete your vehicle’s battery. You could even need to install a second battery or improve your car’s battery depending on the size and output of the subwoofer.


In conclusion, it is clear that a subwoofer needs an amp to function properly. Passive subwoofers require an external amplifier to power them, while active or powered subwoofers come with their own built-in amplifier. However, if you want to improve the sound quality of your system, you can always use an external amplifier for your active subwoofer.

When pairing a subwoofer with an amplifier, make sure to pay attention to the impedance and watts root-mean-square ratings so that they are compatible and will work together without any issues. With the right combination of components, you can create a powerful and immersive audio experience in your home theater or music setup.