how to soundproof your home theater
(Last Updated On: July 27, 2020)

If you’re like me, your home theater audio is always on full blast – max volume. Whether it’s music or a movie, it’s always loud enough to disturb family in other rooms of the house and sometimes even neighbors!

You surely don’t want to be that annoying loud neighbor, disturbing everyone; so today, we are going to fix this problem. In this article, we will discuss the solution – how to soundproof your home theater.

How Can You Soundproof Your Home Theater Room?

When trying to prevent noise from leaking out of your home theater room, there are several ways you can go about it. Some methods are more effective than others and the method you chose will depend on several factors including the size your of home theater room and your budget.home theater noise

If you are tight on cash, there are some easy and inexpensive treatment options, however, if you have a sufficient enough budget, then you can apply heavy-duty soundproofing. We explore all these options below.

These soundproofing options mainly involve reducing echoes in the room, adding mass (e.g acoustic drywall), decoupling your walls and ceilings, isolating your ceiling joists, and more!

Let’s get to this DIY!

Understanding How Sound Works In Your Home Theater

Before we get the tools out and start the actual soundproofing work, it’s essential that we understand the basics of how sound works in your home theater.

This is because successful soundproofing depends on how well you can stop sound from leaving your home theater room.how sound works in home theater

Now sound travels as waves and when the sound in your home theater travels around the room, it hits various objects such as furniture, equipment, the ceiling, and so on. When this happens, some of the sound is reflected, meaning it bounces off and can create echoes in the room.

The rest of the sound is absorbed and turned into vibrations. This is why a very large sound system will cause objects nearby to vibrate. This vibration is actually a transfer of sound and this is how sound can travel through walls or ceilings.

When this happens, the sound from your booming sound system can travel to other rooms in the house or even outside. As far as other people are concerned however, this is noise and it can be rather annoying.

What Is STC And Why Is It Important?

So just how much noise is being produced by your home theater? How is this measured? Noise is measured in decibels and decibels above a certain range are considered noise. You can use a smartphone decibel meter app to check the decibel levels in your home theater and check out our decibel charts to find out more about decibel ranges.

Another important question is, what effects do the materials used to build your house have on sound transmission?

At home, most objects have what’s known as a sound transmission class (STC) rating, which indicates the level of sound it can absorb.stc rating examples

For instance, regular drywall has an STC rating of about 40 decibels, while a single pane glass window has a STC of about 27 decibels. Considering that these are two are the most common materials for building houses, it’s hardly surprising that sound can travel through your house and out of your house.

With a home theater, it means that a high level of sound will travel through your walls, especially when you crank up the volume.

For example, a good home theater system can push say 120 decibels of sound which is very loud. If your home theater is built with regular drywall, then roughly all of 80 decibels (120 decibels less the 40 decides absorbed by the drywall) of sound will escape your room. However, 80 decibels is still as loud as a vacuum cleaner so imagine how annoyed your neighbors will be, especially if the houses are close!

So, considering that you don’t want to cause noise pollution, let’s get to soundproofing your home theater.

How To Properly Soundproof Your Home Theater Room

Now that you’ve got a better grasp of how sound works in your home theater, it’s time to look at how you can soundproof your home theater room.

Firstly, keep in mind that this project can be a quick job or call for significant structural changes, depending on the budget you’re working with and the amount of freedom you have with your space.

For example, those living in an apartment or a rental property may not have the freedom to rip out walls and install soundproofing materials. However, there are still many ways you can go about improving your home theater’s sound absorption qualities without demolishing walls.

Here are the best ways to soundproof a home theater room, including everything from small additions to significant structural changes:

 

1. Adding Absorbent Acoustic Panels or Acoustic Tiles

Let’s state first of all that absorbent acoustic panels and tiles are not the best choice for soundproofing in terms of preventing sound from traveling outside the home theater to other rooms.

These materials are really for reducing echoes and reverberations of sound in the home theater itself.

home theater acoustic panels

Doing this will help to improve the sound quality in the home theater room and to an extent may prevent some sound from escaping outside, but not a lot.

However, they do a fantastic job for those looking for a temporary fix or if your speakers aren’t always on max blast.

Considering that you won’t be covering your entire wall with these panels, you’ll only be making a superficial difference if you don’t know what you are doing. With the right placement of your acoustic panels and choosing the correct types, you can see a real difference. Find out more by reading our guide on how many acoustic panels you need and where to place them.

The other main benefit of using acoustic panels is that they are available in different designs and materials, meaning they will blend nicely with your walls and interior décor.

Even so, acoustic panels can’t absorb all the noise from your home theater room, so they’re only worth it if you can’t afford to make any structural changes in your house. It’s the perfect solution for renters, for example.

2. Mass Loaded Vinyl Barriers

Mass loaded barriers are special soundproofing material that is specially designed with the primary purpose of serving as sound barriers.

They are made from vinyl and metal particles, the combination of which gives the material elastic and viscous properties.Mass Loaded Vinyl Barriers

The barrier comes as a vinyl roll and its only job is to add more mass to walls and therefore create a soundproof barrier.

So, what do we mean by adding mass on your wall?

Mass refers to thick and heavy materials that do well at absorbing sound. However, adding mass to your walls for soundproofing all depends on the kind of materials you’re using; and mass loaded vinyl barriers are perfect for the task because that is specifically what they are made for.

If you are really strapped for cash, you can even hang carpets, heavy drapes or other thick and heavy material as mass to dampen sound in the room.

The elasticity of mass loaded vinyl allows the material to absorb a considerable amount of sound waves while retaining its original shape.

With all of those positives, there must be a downside right? Well, mass loaded vinyl isn’t the most attractive material.

To install it, you can either put it on the outer side of the wall and paint it, or install it on the interior side to keep it hidden.

However, installing it on the inner side of your walls calls for significant structural changes as you’ll have to take down the walls. Luckily, the material takes paint quite well, so it shouldn’t be a huge issue if you install it on the exterior. You can also use it when installing decoupled drywall. You would add the mass loaded vinyl between the decoupled space. This is explained below.

3. Adding Acoustic Decoupled Drywall 

Decoupling is arguably the most effective method to soundproof your home theater room, though it requires some DIY skills.

Fortunately, the process isn’t too complicated, and you can complete it in these few steps.decoupling drywall home theater soundproofing

If you are interested in soundproofing your home theater by adding acoustic drywall, we have written a complete guide on how to soundproof your home theater walls by adding decoupled acoustic drywall.

But first, let’s first understand what decoupling means.

Decoupling means stopping sound vibrations from going through your walls by creating an inner and outer wall with a void between them.

You also add devices that oscillate to reduce vibrations and stop them from passing through the wall. For example, a simple way to do this is to simply hang two drywall sheets on separate studs.

How to Decouple Your Drywall

  • Start by taking down the original drywall to avoid creating the triple leaf effect when decoupling the wall. That simply means having a wall with two cavities, which sound vibrations can swiftly go through.
  • Provided you remove the original drywall, you’ll be left with the studs which you’ll use to hang your new walls. However, you’ll need to use insulation foam to fill in the void between the walls for the best results. The heavier the material used, the better.
  • Before installing the new walls, you’ll also need to install decoupling mounts where you plan to put the new wall. The decoupling mounts are essential components in the project, as they prevent sound vibrations from going through the studs to the other side of the wall.
  • After filling the void with your insulating material and decoupling mounts, it’s time to bring in the new acoustic drywall. This step is one of the most manageable part of this project since you only need to attach the drywall to your decoupling mounts.
  • Now you can paint the wall to match your interior décor.

The most important part of this process is installing the decoupling mounts. It’s important because this ensures that sound vibrations don’t get to the wall through the studs.

That only leaves the space in between the walls, and that’s where the insulating material comes in handy as we already mentioned. They two work together to create an effective soundproofing barrier for your home theater.

The only downside to decoupling is that it might not be fully soundproof against low bass frequencies.

However, you can try to combat this problem by making each wall thicker by using two to three layers of acoustic drywall. You can also use heavier insulation to improve the ability of your wall to absorb sound, especially if your subwoofer is powerful.

If you need more information on this process, we have a complete guide on how to soundproof your home theater wall by adding decoupled acoustic drywall.

4. Damping The Walls and Ceilings

Damping involves sealing gaps and filling voids in the ceilings and walls to reduce the amount of sound that these surfaces can carry and instead absorb it.Green Glue Noiseproofing Compound

By dampening your home theater space, you will dissipate and reduce sound in the room. Fortunately, there are lots of damping materials on the market.

Most damping materials are made of polyurethane, and they do a fantastic job absorbing the sound waves. One great example and the the best we have found on the market is Green Glue Noiseproofing Compound.

Materials like this can be used to seal gaps and spaces in the walls and ceilings and can be easily painted into oddly shaped spaces, like on french window panes or peeled-and-stuck into easily accessed spaces like cabinets.

However, before you go out and purchase damping material, you need to measure the surface area of the area you plan to cover.

 

5. Isolating Ceiling Joists

When soundproofing a home theater, many people often forget the ceiling or it becomes a second thought.

However, soundproofing your home theater ceiling is very important, especially if there are other floors above the home theater room. In this case, soundproofing your home theater ceiling is critical.

isolate ceiling joists soundproof home theater

Though the ceiling might have insulating materials installed during the construction, they can still transfer sound easily.

For this reason, you might need to bring down the older ceiling and install some new isolating ceiling joists that are decoupled from the old ones. This means you will be adding damping materials between both so that it dissipates sound.

You can install new joists using mounts in a similar way as you do when decoupling your walls with acoustic drywall. For this reason, many people chose to do both ceiling and walls at the same time.

It’s also recommendable to use joists that can reduce vibration levels. That means the heavier, the better, though using flexible materials might be beneficial. Note however that if you do this, you will lose some ceiling height – typically about 2 or 3 inches.

If you want to learn more, you can check out our complete guide on how to soundproof your home theater ceiling.

 

6. Insulating The Ceiling, Walls, Windows, Doors, and Gaps

Insulation is very important to keep your home at a constant, favorable temperature, but when it comes to your home theater room, insulation is important for soundproofing.Insulating The Ceiling Walls, Windows, Doors, and Gaps

You can insulate your ceiling, walls, windows, doors and all gaps in the home theater space by using sound absorption materials like loose fiberglass, cellulose, or rockwool insulation. Her’s how you can approach each:

Ceiling: If you decide to soundproof your ceiling, then isolating your ceiling joists and adding insulation is a great way to add more soundproofing to your ceiling. [Learn more]

Walls: If you are adding decoupling acoustic drywall to your walls, then adding insulation between the old wall and the new drywall will improve the wall’s ability to reduce sound passing through. [Learn more]

Another great way to go about soundproofing your windows in your home theater if you dont want to remove them is to add home theater soundproofing curtains.

Windows: Windows and doors are notorious weak spots that challenge many people when soundproofing the home theater. Unfortunately, you can’t do much to improve the situation since you can’t merely load mass into them like you would with walls. [Learn more]

However, you can go ahead and eliminate the windows for a true theater experience, but that might not be an option for many people.

If not, you can also use an acoustic sealant caulk to line the frame and around the edges if taking it out isn’t an option. If you are looking for more options, check out our complete guide on soundproofing your home theater windows.

Doors: For cheap or light doors, the best solution is to replace them with heavier doors made of better materials.

You can consider buying soundproof doors if the budget allows it, as they are more expensive.

However, when you’re tight on cash, you should consider sealing the gaps on the door frames and edges with a sealant material like Green Glue Noiseproofing sealant.

For more detailed information, check out our guide on soundproofing your home theater door.

 

7. Soundproofing The HVAC Vents

HVAC systems are heating, ventilation, and air conditioning systems. For this reason, they compromise of large metal pipes that run along your walls.home theater HVAC system soundproofing

This makes it easy for sound to travel through them, and unfortunately, there isn’t much you can do about reducing the sound from the source. However, some minor adjustments can reduce the sound in your home theater space.

1. Insulate The Ducts With Liners

Insulating the ducts with liners is a great way to add insulation which actually makes the system more efficient as well as keep the ducts quieter. You don’t even need to do anything expensive, using heat-proof foam covered with fabric is an easy way to do this.

2. Adding Soundproofing Wrap

If you don’t want to do anything invasive, a simple and quick option is to wrap the pipes and air ducts. Pipes around your home can be a significant source of noise. You can even wrap heating and cooling ducts. For example, the BXI – Soundproofing Sheetis a great option that is highly heat resistant.

3. Cover Unused Vents

If your home theater room does not need constant heating or cooling, you can install a magnetic vent cover over the air vent.

This magnetic vent cover will act as an air vent sound damper. However, you will need to remove it occasionally to prevent mold growth.

4. Use Acoustic Sealant

Additionally, using a lot of acoustic sealants to cover all the gaps in the vent might also work.

 

8. Soundproofing The Floor

The floor is probably the last place you’ll think of soundproofing in your home theater. Yet the floor is primarily responsible for sound interference like echoes.

That’s because floors carry vibrations to all the walls and are susceptible to both airborne and impact noise (walking, things falling, etc).soundproofing home theater floor

It gets even worse if your home theater room is on the second floor or higher. In this case, soundproofing the floor is completely essential or you will disrupt your neighbor below.

To soundproof the floors, it’s best to lay a thick carpet with a soundproof underlay. While they are a bit more expensive than regular underlays, they work great for apartments and saves you from looking for a DIY solution.

You can also lay some thick rugs on your floor if it’s made of hardwood. Though it won’t make a huge difference, it will help somewhat.

 

Can I Use Soundproofing Foam To Soundproof My Home Theater?

A lot of people believe in the misconception that adding soundproofing foam panels to the wall will somehow prevent sound from leaving the room, but that is not quite true.home theater soundproofing foam

This common misconception stems from the fact that most recording studios have foam panels on their walls.

However, the foam panels installed in recording studios are for acoustics control and not soundproofing. Meaning, it helps in maintaining good sound quality. This is also why acoustic panels are not very effective at soundproofing since many of them are made from foam.

Why is this so? Let’s explain a little more!

Foam is not an effective material for soundproofing since it doesn’t have enough mass to block sound.

However, it’s capable of absorbing a huge amount of sound, making it an excellent material for controlling the acoustics of a room. It’s natural to assume that foam can absorb all the noise from the room, but unfortunately, that is not the case.

 

Bottom Line

While soundproofing your home theater might seem to be a massive job, it will be worth the effort if you like maxing your audio and if your neighbors or family members are complaining.

However, the success of this project depends on your budget and the changes you are allowed to make to the room.

The job follows the same basic principles as in heat insulation, so you’ll have a good idea of what you’re looking for if you’ve done this kind of work around your home. Be wise while planning, and make sure you choose solutions that work with your place.

Good luck!