How Important is a Subwoofer in a Home Theater System?

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Have you ever had one of those moments when watching a movie in a cinema and wondering how they managed to achieve such a nice and powerful sound? Well, in most of the action or dramatic scenes, the key is the subwoofer. This thing is one of the key elements of every good speaker system, no matter if it is 2.1, 5.1, 7.1, or bigger. If you want to buy a great home theater system or to add a subwoofer to your existing speaker system, stay with us and you will find out all about the importance of a subwoofer and about different ways of optimizing the subwoofer’s performance.

What Is Subwoofer and How It Works?

Subwoofers are different from the regular speakers because they are made specially for reproducing very low-frequency tones, usually from 20 to 125 Hz (or up to 200Hz). Subwoofers are the inseparable part of every quality speaker system because regular speakers can’t produce such low tones. Actually, these tones are so low that you may not even hear some of them but you will definitely feel them due to strong vibrations.


Subwoofers are easily noticed because they are often the largest speakers in the speaker system, they have their own enclosure and their diameter can vary from 20cm to 40cm. When it comes to subwoofers, the larger is always better because only large speakers can reproduce extremely low frequencies.

These speakers are usually connected to the audio receiver or amplifier/preamplifier (like all the other speakers in a system), which sends the low-frequency signals or low-frequency effects (LFE) to the subwoofer. The speaker amplifies the incoming current, the magnetic coil moves and creates the cone vibrations which are converted to sound that we hear. In order to produce such powerful sounds, the subwoofers are usually provided with their own power supply.

Subwoofer’s Role in a Home Theater System

Technically speaking, a subwoofer is not absolutely necessary – your speaker system will work even without one, but there are many reasons why you should have it and here they are.

As we’ve said, regular speakers can’t reproduce all the frequencies – they won’t be able to deliver the lowest tones and, as a result, an important part of sound will be taken away from you. Without the subwoofer, you will be exposed to poor bass or too stressed highs. The sound won’t be balanced and full. However, bass and sub-bass frequencies are the ones that add fullness to the sound, making it complete, rich, powerful and even three-dimensional.

Subwoofer’s Role in a Home Theater System

This means that without the low-frequency tones, you will be just a passive listener of a soundtrack or a passive observer of a movie scene. Well-produced low-frequency tones involve you into every scene, into the music, and, of course, enable you to feel, hear and see exactly what the artist wanted you to feel, hear or see. Even if you aren’t able to hear some of the extremely low bass tones, you should have a subwoofer that can produce them because you will definitely be able to feel them through the vibrations of your furniture. Without well-produced bass, you won’t be able to hear the drums well just like you won’t be able to feel all those explosions in action movies.

Of course, in order to get a perfect subwoofer performance, it is not enough to simply buy the subwoofer and connect it to the source (receiver, amp). Good installation is the key factor. In the following text, we will explain what you can do to improve the subwoofer’s performance.

How to Optimize Subwoofer Performance?

Poorly installed and placed subwoofer could deliver too boomy or poorly defined bass. In both cases, there will be a gap in the frequency spectrum between the regular speakers and the subwoofer, which means that you won’t be able to enjoy your music or video content completely. On the other hand, a nicely installed subwoofer brings so much joy to every room and once you experience the real feeling, you won’t be able to settle for anything less than perfect.

Subwoofer Performance

When we say “subwoofer installation”, we actually mean its setup and its placement. These are the key factors that affect its performance. Let’s see how you can optimize it and adjust to your requirements and preferences.

Subwoofer placement

Many will say that subwoofers are non-directional speakers and that you don’t really have to worry too much about their placement. This means that there is no fixed or special place where your subwoofer should stay in your apartment in order to produce perfect bass. Well, this is only partially true. You will definitely feel the vibrations and hear the bass wherever you place the subwoofer but that doesn’t mean that its position in the room is completely irrelevant.

The subwoofer placement can significantly lower or enhance the overall sound quality. The perfect placement should be thoughtfully planned because the final effect depends not only on the subwoofer placement but also on the furniture placement. You can find out more about this in our previous articles.

Poor/wrong subwoofer placement can be the key reason for disappointment with a new home theater system, so let’s see how to avoid that.

Place your subwoofer near a wall

Placing the subwoofer in one of the corners of the room or simply near one of the walls, improves its performance in the way that increases the overall level of bass. This happens because wall proximity causes the sound coming from the subwoofer to reflect from the walls, which increases the bass power and strength.

Place your speaker under your couch

If you really want to feel every movie scene, try placing your subwoofer under your couch or coffee table. Most of them have cavities that are perfectly sized and shaped for placing an average subwoofer. This way, you will be closer to the source of powerful bass tones and vibrations that will drag you into every scene.

Use a separate subwoofer amplifier

Maybe you haven’t noticed it but numerous surround sound amplifiers have a special subwoofer output and it is used to power the subwoofer and enhance its performance. You can simply take a cable that will go from your main amp to the second stereo or mono amp dedicated to your subwoofer, set this up once and later control every change with the main amp.

Sometimes two is better than one

5.1 and other X.1 systems are the most popular ones. They all have only one subwoofer. In some cases, especially if you have a large room, having two or even 3 subwoofers instead of one is completely fine. In fact, it’s desirable and it will improve bass performance.

Good bass management

What does bass management mean? This is the process of removing the bass portion from the signal that goes towards the speakers and re-routing them to the subwoofer or subwoofers. This is actually very similar to a regular crossover. The device that separates the bass portion from the signal is placed either in the subwoofer or in the receiver.

In case of 2.1 systems, the bass is managed in the subwoofer that filters the signals and passes the mid and high-frequency signals to the satellites / regular speakers. The situation is a bit different with 5.1 or larger home theater systems because they have the AV receiver that receives all the signals and filters them out, removes the low-frequency tones from the signal that goes to the satellites and sends them to the subwoofer.

Choosing the subwoofer with the right enclosure

You probably know that the subwoofer enclosure affects the bass quality a lot. One of the common ways of achieving high-quality bass is to buy the subwoofer with an opened “bass-pass” enclosure. These cabinets are tuned, resonant and the sound can go out through more than one port. These cabinets are great when you need powerful bass for watching action movies with many explosions and crashes but it can also be too boomy and inadequate for high-quality songs where you want to listen carefully to the bass guitar sequence.

Correct alignment

One of the most important things related to speaker system installation, especially if your subwoofer and your satellites are made by different manufacturers, is to match their phases. This actually means that all the parts of the system should have the same polarity and time alignment. In the opposite case, the crossover region will have some kind of level dip and that won’t sound good. Every part of the system has different phase characteristics that have to be aligned. Also, when they are located in different parts of the room and at different distances from the listening position, you could experience some kind of time delay.

All of this can be solved with a good phase controller that is usually located on the quality subwoofers. A small adjustment can change the overall sound quality and harmonize the speaker system.

In the end, we just want to say that all these tips should be taken with a pinch of salt because every home theater system and every apartment or house are completely different, with different features and acoustic properties. This is why the only correct and honest advice is to experiment with both – your speaker system and your furniture in order to find the perfect combination.


  • Thanks for sharing this post.
    Here is my theory about subwoofer in home theater, “Without subwoofer home theater can not deliver a great sound”
    What do you think?

  • Thanks for sharing some of the best tips for placing the subwoofer in the right place to enjoy the best sound quality. I believe that these tips would be really helpful for a beginner as well as advanced people. Keep it up.

  • It’s good to know that regular speakers can’t reproduce all the frequencies that subwoofers can which can cause imbalanced sound. My brother is looking to put in a home theater system so that he can have people over more often and entertain his family. I will be sure to recommend he look into a theater installation service near him and talk to them about the importance of a subwoofer in his setup so that he can experience the benefits of a low-frequency speaker.

    • Avatar AudioReputation Team

      Hi, Brad

      Thanks for sharing your impressions. As you’ve said, home theater system is incomplete without a subwoofer.

      Your AudioReputation Team

  • Well subwoofers are needed to enhance speaker level as it also uses to increase voice in low frequency moreover you need it to make best speaker quality as without it not possible to give a home theater a professional look.

  • Thanks a lot for sharing your incredible ideas. It is an appreciated and pretty tip for all those music lovers. What a Fatal post for those who want to upgrade exist subwoofer with new one.

    • Avatar AudioReputation Team

      Thanks for your kind words, Krstin

      We’ll try to stay informative and helpful.

      Your AudioReputation Team

  • Thanks you very much for post, This the best guide post for car audio sound system include details. It is a very effective and helpful share for beginners. Author keeps all think at this share.

  • I t’s interesting how a subwoofer poorly installed and placed could deliver too boomy or poorly defined bass. My brother likes to watch sports game s and it would be great to have a home theater system. I will recommend looking for one so that we all can enjoy when we visit him.

  • Thanks a lot for sharing your incredible ideas. It is an appreciated and pretty tip for all those music lovers. What a Fatal post for those who want to upgrade exist subwoofer with new one.

  • I love your suggestion to place the subwoofer under the couch in a home theater to get that rumble box experience. It may not be for everybody, but it sounds like a great way to enjoy an action movie. My husband and I want to install some speakers in our home theater, so we may have to try some of these ideas for a better experience.

  • Avatar Angela Waterford

    I want to have a home theater system that has a subwoofer with it. If I were to choose, I think I’ll ask a service to get me a good one since regular speakers can’t reproduce all the frequencies of the songs that I want to listen to. Thanks for mentioning that good installation is a key factor in getting a good system, so I’ll make sure to hire a good one.

    • Avatar AudioReputation Team

      Hi, Angela

      Thank you for your kind words. We have nothing to add to your comment – everything you’ve said is absolutely correct. If you are not a techie person and you don’t know much about audio equipment, you should hire some professional service to do the job for you.

      Best regards

      Your AudioReputation Team

  • Avatar Thomas Jameson

    It’s good to know that the placement of the subwoofer in your home theater system can significantly lower or enhance the overall sound quality. My brother has been wondering if it matters where he puts a subwoofer. I’ll pass this information along to him so that he knows that the placement of his subwoofer can impact his home theater system’s overall quality.

    • Avatar AudioReputation Team

      Hi, Thomas

      Thanks for your comment. The subwoofer placement matters a lot. For example, if you are dealing with a subwoofer with a rear-firing bass reflex port, placing it against the wall (but not too close) will improve the bass response and make it punchier and more impactful.

      We are glad we were able to help

      Your AudioReputation Team

  • Avatar carsubwoofer

    What a great article share. A great contribution especially for someone looking forward to buy a car subwoofer, amplifier and enclosure. If anybody want to install new one, this is the most effective share, that will be very helpful for best choice. Thanks a lot for post.

  • Author has kept superb unknown ideas, that will help most of music lover. It is not only includes huge ideas but also user friendly with figure-out post. If anybody read this article will reinforce to get this. Thanks a million for this post.

    • Avatar AudioReputation Team

      You’re welcome, clairedivas

      Thank you for your kind words

      Your AudioReputation Team

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