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Master Thread of favorite AT links

post #1 of 3
Thread Starter 
Alright. I got plenty of good feedback and links from my other thread looking to collect favorite AT links together in one place. Rather than bump that thread to the top several times, I am going to move the collected links to this master thread. I hope this proves helpful to others.

Acoustic Basics
Start here to gain a basic understanding of acoustics - what it is, why we worry about it, and what we can do.
http://www.realtraps.com/art_basics.htm
http://www.gikacoustics.com/education.html

How much Soundproofing do I need?
http://www.avsforum.com/avs-vb/showt...0#post17318270

This link goes to some discussion about what is generally a good way to start.
http://www.avsforum.com/avs-vb/showthread.php?t=1063494

It is important to keep in mind that while a lot of the discussion is centered around absorption of different sounds for different reasons, it is not the only - or necessarily the best - solution to employ; as is pointed out here.
http://www.avsforum.com/avs-vb/showt...6#post20245366

To know what we need to do, it is helpful to know what we are going for.
http://www.avsforum.com/avs-vb/showt...9#post13616679

While not ideal for multi-channel home theaters, here is some information about setting up a two-channel room
http://www.realtraps.com/art_room-setup.htm

First Reflections
First reflections are simply sound that reflects off of 1 surface between the source (speakers) and listener. In a typical rectilinear room, there are 6 first reflections per speaker per listener (front wall, side walls, rear wall, floor and ceiling). The following links specifically discuss treating surfaces for first reflections.
http://www.avsforum.com/avs-vb/showt...29#post8119529
http://www.avsforum.com/avs-vb/showt...5#post13795215
http://www.avsforum.com/avs-vb/showt...6#post13787686

In typical home theater-sized room treatment discussions, first reflections and early reflections are terms that are exchanged for each other. They are related, but not equal. The definition for early reflection is:
http://www.avsforum.com/avs-vb/showt...5#post13794985

Room Modes
Room modes are frequencies that are either amplified or nullified at the listening position(s) because of the size and shape of the room. Typically, when talking about modes, it is the low frequency modes that are of concern (under 125 Hz). To handle this, the most common solution (by far) is adding broadband absorbtion that reaches to the lowest frequency possible. The key though is broadband - most absorbtion is too thin to be broadband.
http://www.avsforum.com/avs-vb/showt...21#post7682921
http://www.avsforum.com/avs-vb/showt...67#post8250967
http://www.avsforum.com/avs-vb/showthread.php?t=1188614
http://www.avsforum.com/avs-vb/showthread.php?t=981877

There are multiple ways to build bass traps. Some of these are the broadband absorbers described above. A few are much more specific and targeted to problem frequencies. The general consensus though is that broadband is usually the better way to go.
http://www.avsforum.com/avs-vb/showt...2#post11221502
http://www.avsforum.com/avs-vb/showt...66#post8119066
http://www.avsforum.com/avs-vb/showt...12#post5436712
http://www.avsforum.com/avs-vb/showt...77#post7706877
http://forum.studiotips.com/viewtopic.php?t=535
http://www.avsforum.com/avs-vb/showt...30#post7668430
http://www.avsforum.com/avs-vb/showt...41#post9602041
http://www.avsforum.com/avs-vb/showt...1#post10472481
http://www.avsforum.com/avs-vb/showt...php?p=11029190
http://www.gearslutz.com/board/bass-...ass-traps.html

Another option for adding absorbtion is to put in a drop ceiling.
http://forum.studiotips.com/viewtopi...f4d6d71145b02b

Since many people choose to put the absorbtion behind fabric, a common question is what to do with areas the do not have absorbtion to make them look the same as the ones with absorbtion.
http://www.avsforum.com/avs-vb/showthread.php?p=8665187#post8665187

It is important though, to keep in mind that many building codes have requirements against flammability for anything that is integral to the wall. More details can be found here (although keep in mind that the specific rules do vary with where you live)
http://www.avsforum.com/avs-vb/showt...5#post10700625

Absorption is not the only way to treat a room. In many cases diffusion does work better. There are reasons (cost, space, looks, lack of quantitative standards) why diffusion is not more common, but in the quest for the best sounding room it should not be ignored.
http://www.avsforum.com/avs-vb/showthread.php?t=969483
http://www.avsforum.com/avs-vb/showthread.php?t=1312919
http://www.audioasylum.com/audio/twe...ages/1725.html
http://www.rpginc.com/news/library.htm
http://www.subwoofer-builder.com/qrd.htm
http://www.amazon.com/Acoustic-Absor...1841292&sr=1-1

Useful Links
Studiotips has information on multiple ways to treat a room. Links to several methods can be found in their forums here:
http://forum.studiotips.com/viewforu...5457b40856364d

Bob Gold has put together a list of absorbtion coefficients for a lot of different materials. This is very useful information for anybody looking to build their own absorbers. Note: there are links to different types of absorbers at the bottom of the page. Do scroll down past the material by material comparisons to get to these additional goodies.
http://www.bobgolds.com/AbsorptionCoefficients.htm

SAE (Society of Audio Engineers???) has a lot of information
http://www.sae.edu/reference_materia.../fullindex.htm

Real Traps has a lot of information online
http://www.realtraps.com/info.htm

Here are some useful calculators
http://www.marktaw.com/recording/Aco...Calculato.html

For some interesting information on a number of different plastics (including some insulating foam some people use) you can look at
http://forum.studiotips.com/viewtopic.php?p=13505#13505

Build Thread Links. Many of these have their own collections of links as well that are AT related from the ground up. So don't skip the links on construction techniques.
http://archive.avsforum.com/avs-vb/s...hreadid=422490
Elill http://www.avsforum.com/avs-vb/showthread.php?t=1186799
Dark Knight Theater http://www.avsforum.com/avs-vb/showthread.php?t=1043747

Of course, if after all of this, you still want more help, there is a Pro Theater Layout Service that AVS has helped put together. The cost is much less than a turnkey solution and there are many happy clients.
http://www.avsforum.com/avs-vb/showthread.php?t=1267433
post #2 of 3
Thread Starter 
Here is a discussion that starts doing a deep dive and offers up a lot of different names of experts/academics who have contributed to theory and practice. As of today, it is 8 pages long and veers between practical information and detailed theory and minutia. Visit only after you are comfortable that you have a basic understanding of AT.
http://www.gearslutz.com/board/studi...ffraction.html

Gearslutz has plenty of discussions that go to much more technical levels than the AVSforum does. Here are some additional threads worth looking at.
http://www.gearslutz.com/board/bass-...absorbers.html
http://www.gearslutz.com/board/bass-...bsorption.html
http://www.gearslutz.com/board/studi...q-4-avare.html
http://www.gearslutz.com/board/studi...4207-sbir.html
post #3 of 3
Thread Starter 
Reserve. This can be used when links overflow the first two posts
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