Instructables
What better way is there to spend an afternoon, than having your kids help upgrade the performance of your home theater?  If you're a geek dad, the list is pretty small.

There are many way to improve your home theater, and adding sound-absorbing panels is an inexpensive way of doing it.  In my case, it's almost a necessity:  the hard concrete walls in my basement home theater have a nasty tendency to bounce sound around in unpleasant ways.  The effect was made even worse when the carpet was replaced with hard laminate floors.

The walls themselves were mostly bare, painted concrete.  The walls needed decoration - artwork, pictures, whatever.  Just something to make the place look less sterile.

My home theater also happens to share a space with the kids' playroom.

So what happens when you put all these requirements into blender and pour the frothy goop into a big, chilled mug?  Simple, yet effective child-decorated sound absorbing panels.

Step 1: How They Work

Picture of How They Work
In a room with hard, flat surfaces, sound tends to do nasty things.  Mostly, it bounces around and hits your tender eardrums multiple times from different angles.  It mixes in weird ways, drowning out some parts of a soundtrack while emphasizing others.  In short, the hundreds or thousands of dollars you spent on a nice amplifier and speakers is wasted because the acoustic properties of the room are lousy.

The purpose of a sound absorbing panel is obvious:  it absorbs sound in a room.  When placed in strategic locations along the wall, the effect is dramatic.  High frequency "ringing" is killed off, and bass is no longer muddy or boomy.  All those sound waves that would have bounced off the walls are instead mostly absorbed by the panels, so that the primary wave from the speakers is what you hear most.

The basic construction of these panels is simple, and certainly nothing new.  They are simple artistic canvases with thick wood frames, stuffed with sound-absorbing "eggcrate" foam.  The panels are decorated to suit the decor of the room. In my case, decorated with the help of my wife and kids, to add colour and fun to our home theater/rec room/play room.
 
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Keznaa1 year ago
A seat cushion that's a great idea! I never thought about doing that. Looks like I have a bunch of projects to start :)
Keznaa1 year ago
Could you use thick mattress top foam instead? I have this really high quality memory foam type mattress pad that I don't use anymore and was wondering if its dense enough, could I use it?
jeff-o (author)  Keznaa1 year ago
Worth a shot. I'm not sure how it compares to proper sound absorbing foam, but it won't hurt. If you find it isn't working well you can always remove the foam and turn it into seat cushions.
Man, I REALLY wanna try that now. :)
ToniRose2 years ago
Well done. And the most attractive kid's fingerpainting I've ever seen.
Shut Up Now4 years ago
Very neat idea, but won't the paint turn the panels into reflective surfaces for sound? Also, that type of foam absorbs only high frequencies. consider using rockwool or 703 fiberglass insulation in your existing panels to get a better end result. (i suggest rockwool)
jeff-o (author)  Shut Up Now4 years ago
I thought about that, but then I did a simple test: I held my ear to one side of the canvas and had someone speak on the other. Virtually no difference from having no canvas there. So, I guess most of the sound passes straight through. And yes, if you want to absorb more lower frequencies too, then a denser insulation will help. You can even install fiberboard, which is easier to use in this case than fiberglass or rockwool.
cool. I am sure the type and amount of paint changes its effect on the panels.
.  While these are definitely not "audiophile-quality" panels, they should have a noticeable (good) effect on sound quality (jeff-o's observations seem to confirm this). Yes, the paint (and the wood frames) will have a detrimental effect, but not enough to matter to most ppl. (And most ppl don't want to look at  (or pay for) exposed, ugly, "real" acoustic panels.)
.  Ie, I like 'em.
jeff-o (author)  NachoMahma4 years ago
Definitely, if you're going for all-out performance then these are not what you're looking for - but then again, if it's that important then you'd build a purpose-built room with isolated walls and ceilings, and thick carpet on the floor! ;)
I wondered about the same, regarding the paint and gesso suggestions. Maybe staining the canvas with ink (or watered-down paint) would maintain the porousness of the canvas and reduce the risk of reflection? Might have to go with simpler designs for this strategy... no Dali masterpieces on your acoustic panels :)
EmmettO jeff-o4 years ago
Perhaps acoustic ceiling tiles would work? Actually that's what I thought you were painting when I first saw the instructible. Either cut it to fit behind the canvas, or Gesso them and then paint them directly. You'd have to do something to pretty up the edges though.
jeff-o (author)  EmmettO4 years ago
Meh, they're pretty thin, aren't they? Fiberboard is definitely cheaper though, and would probably work better.
EmmettO jeff-o4 years ago
They're about a half inch thick and absorb a lot of sound. Fiberboard is really hard and is more likely to reflect sound.
jeff-o (author)  EmmettO4 years ago
Actually, I was referring to the rigid fiberglass insulation used in this instructable.
OddAmeoba3 years ago
Has anyone ever tried using the pick foam board used for insulation? I tend to use this stuff lots for other projects and if it works it would be rather handy here i'm sure.
I'm really curious about the same, for the same reason. Did you ever find out or test the difference?
electronbee3 years ago
I really like this idea! I have a sound issue in my basement theater, mostly high frequency, and this would be a great solution. I thought about draping the room in thick curtains or such but I've seen that solution and it can be gaudy.

But, I think I will have some posters or something printed out on canvas and then put the acoustic foam behind it. That way I get a good compromise!
NetWell4 years ago
One of the responders here is correct. 1.5" thick material will give you next to no low base absorption, which is always the key culprit in attempting to control acoustics in a home theater environment. Plus, egg crate foam sold retail does not carry the same pores per sq inch that acoustic foam will....in other words, it might be great for bedding or packaging, but not converting sound waves. Also note that foam degrades over time, there are better sound panel alternatives than the material chosen here. A popular website is www.eSoundproof.com that showcases multiple options that will achieve superior results.
jeff-o (author)  NetWell4 years ago
Ah, I see I've attracted the attention of the commercial soundproofing guys! Well, I hope you stick around for a while and contribute something to the Instructables community, aside from a link to your website. Also, I did use acoustic foam, not the plain old packaging stuff...
richardsalt4 years ago
Thank you for this inspirational ins'ble. Beautifully illustrated and something that I shall definately attempt in my rather echo-prone house. Many thanks.
jeff-o (author)  richardsalt4 years ago
You're welcome! Best of luck. :)