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So with all the horn craze and added speaker builds here lately I thought we should all get our rooms sounding good. Pointless to have great sounding speakers if they are playing in a bad room. So here is what I am thinking, we try and put together a variety of different acoustic treatments that we make for ourselves, get a parts list for each type, and a cost breakdown. A full how to that includes diffusers, absorbers, bass traps, and any other types we can think of.



I got the idea of doing this thread after being frustrated trying to read through the master acoustics thread that has over 5000 posts and no index. Once we get this thread with some content I will start up a good index.
 

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Two words: DO IT!


The living room in my old apartment had a vicious echo. The easiest way to test this in your room is the 'clap test'. Just clap your hands as hard as you can and listen for the echo. If you hear an echo, your room will benefit from room treatments. My old room echoed for nearly a second! Echos you hear clapping near the sound source are worse than those elsewhere in the room--since those are the ones your speakers will be dealing with.


My treatments are rectangles built from pine 1x4's, stuffed with R-30 insulation, covered with batting, and finally wrapped in burlap. I usually place 2 behind the fronts, and two more behind the listening position. This does an excellent job of knocking out the echo from the fronts. Other excellent spots are wherever you're getting a direct reflection from your speakers to the listening position--on the floor, the ceiling, and the walls between you and the speakers are all sources of echo.


All in all, I was out all of $120 for everything, including a new staple gun and hand saw (all the tools you'll need, outside of a heavy knife and scissors). The difference was remarkable--voices that were muddied, cleared. Instruments that were 'somewhere', materialized in front of me. So do it. You'll thank yourself if you do.


I'd be glad to go into more detail if you'd like.


I can go more into depth if you'd like me to.
 

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He's a DIY side surround next to some of my Diffusors. Not sure how safe the blue styrofoam is but the diffusors work great.


The room is live in back and dead up front. Really makes a difference. I use 2" ridgid OC 703 board. Rumor has it 4" hits a wider spectrum of sound.
 

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built 2 of these for my open living room so far! hope they work well. and baaahhhh to my floor, it is not level at certain places., going to build up to 10 more of these to go around my room.


first time building these, 2x 2" oc703 per frame. birch plywood - homedepot crap grade, birch that looked perfectly flat, but wasn't. ripped to size on a table saw and miter saw i have never used before.

burlap adhered to the sides of the oc703 with scotch 90 spray adhesive. No adhesive on the faces that are not covered with wood. friction fit in the frame. approximately $35 in materials each, maybe less. will maybe shellac them eventually.
 

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Here is a pic of one of my sidewall DIY Poly Diffusor arrays (along with a bunch of broadband absorbers placed at primary and secondary reflection points lower on the sidewalls). The build thread for this project is found on a Canadian AV site I frequent.





Next is a couple of pics of my DIY Skyline Diffusor project, one "naked" and the others finished and in place. Again the associated build thread is located on the CAM Forums.









The 2'x4'x4" broadband absorber panels seen in the first pic are DIY also but built before it occurred to me that others might find a diary of their construction useful. I've built Fiberglass pipe insulation "Tube Traps" too but again there is no build diary. There is however, a ridiculously long thread (you've been forewarned!
) with lots of pics which recounts the evolution of my dedicated room, the gear within, and the room acoustic treatments used to eek the best performance possible.


Happy Trails!
[email protected]
 

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Great idea for a thread.



It should prove very beneficial when an index is added and perhaps a sticky thread.


I am exploring the idea of treatments myself.
 

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Quote:
Originally Posted by kgveteran /forum/post/18130745


He's a DIY side surround next to some of my Diffusors. Not sure how safe the blue styrofoam is but the diffusors work great.


The room is live in back and dead up front. Really makes a difference. I use 2" ridgid OC 703 board. Rumor has it 4" hits a wider spectrum of sound.

Blue styrofoam should never be used in an exposed application. It it flammable and creates toxic smoke. Not sure how you could treat/coat it for safety.
 

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Here is an old picture of my front wall with the screen removed. Panel frames are 25.5" x 49.5" x 3" deep. Inside of frame is 24" x 48" to use a full piece (no waste) of semi-ridged mineral wool. I have 2" of mineral wool in each, covered with AT fabric. This gives a 1" air space behind the mineral wool. Corner traps are made similar except I used 4" thick mineral wool. Back wall is treated the same. Blocking above the panels is what holds the screen out from the wall. The shaft below the blocking is part of my masking system.

[/IMG]


Wall has been changed to this:

[/IMG]

Now using JTR T8 behind AT screen.
 

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this is a good thread and going to be a tough one, as different speaker designs match with different acoustic treatments.


i'll kick in:


gik
http://www.gikacoustics.com/


ready acoustics
http://www.readyacoustics.com/index.php


the guys at the bbc (britian) have also experimented with several designs. they had a pretty good paper, but i can't find it at the moment.
 

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There is lots of good info in my old room treatment thread:

http://www.avsforum.com/avs-vb/showt...&highlight=faq


DIY speakers is really the wrong forum for this type of thread, but I'll be reading every post of it.



Btw, I went with the 2" Owens Corning stuff and it made a very noticeable difference in my sound. I'd do it again in a heartbeat, but I'd use 1" instead. The 2" stuff sticks out like a sore thumb on my walls.

I should mention that I have bare flooring (not carpeting).
 

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"DIY speakers is really the wrong forum for this type of thread,"


with respect, i disagree. lots of room treatments are diy and diy speaker seems to be the most 'scientific/techy' area of the whole avs website. i think this is why he posted here.
 

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Quote:
Originally Posted by LTD02 /forum/post/18134818


"DIY speakers is really the wrong forum for this type of thread,"


with respect, i disagree. lots of room treatments are diy and diy speaker seems to be the most 'scientific/techy' area of the whole avs website. i think this is why he posted here.

I agree. If you are willing to build large subs and or build your own speakers, then you certainly would be the type to build sound treatments. I go to the speaker threads and see expensive speakers in rooms that have terrible acoustics.
 

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Quote:
Originally Posted by maxmercy /forum/post/18135400


Here's how I made my broadband absorbers:

www.basstraps.net/DIY-BASS-TRAPS-MADE-EASY.pdf


I have 10 4" thick ones for bass trapping, 4 2" ones for first reflections...


They make a serious difference.

Nice PDF! Well documented and easy to follow, I like it!
 

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Discussion Starter · #20 ·
All VERY good examples so far. Building some standard panels for 1st order reflection points is probably going to be my next project. My room is pretty big with a lot of bare walls. I can tell from listening in smaller rooms that my setup should sound better and I believe that some panels will probably help out. I'm not quite ready for big bass traps yet, but I figure a couple on the wall will help out and make the room sound much better. Looking around the internet at others that have done this I believe for as cheaply as $75-100 you can make 4-2'x4' panels. Compared to what companies charge that is a very good deal.


UFOKillerz, That's a good idea about the moveable panels. I believe if someone has a closet to put them in then they may be able to get those past the wife a little easier. It may be easier to move them to the spot you need on occasion than to try and say, "Hey honey, I want to put up some acoustic panels...on the walls".


On a side note and unrelated, is anyone having trouble getting e-mail notifications for your subscribed threads? I haven't got a single one for this one or the Danley thread and that has had probably 30 posts since my last notification. EDIT...WTF?? I just looked at my subscriptions and it went up from around 15 or 20 to 123!!! What's going on there? Did they make a update for the forum that makes it sort of like HTShack so that if you post then it auto-subscribes you??
 
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