Acoustic Treatment Research Material

[jomari]

Good day!

A couple of us have been having a great discussion regarding room acoustics, treatments and innovations as to how to further improve our current home theater setups, both dedicated and living areas... you can find that thread here, thanks to prerich...

Here is a great introduction to the topic...

http://www.hometheaterhifi.com/volum...04-part-1.html

Although not as easy to read in the first place, this is tho a great amount of knowledge gathered by yet my much appreciated colleague, Irritate Guy over at Sound and vision magazine...

Videos

How to build a bass trap -- http://youtube.com/watch?v=iyYUpkpL0gw

How to set up a listening room -- http://youtube.com/watch?v=lbLVjHfHahg

Modal Ringing and resonance -- http://youtube.com/watch?v=aHkAFSZmMk4

RealTraps videos -- http://www.realtraps.com/videos.htm

Articles on DIY

DIY Corner Absorber -- http://www.johnlsayers.com/HR/index1.htm

DIY Acoustics -- http://remixmag.com/mag/remix_diy_acoustics/index.html

DIY Panels -- http://geekwithfamily.com/2006/09/22...oustic-panels/

IG DIY Panels -- http://forums.soundandvisionmag.com/...thread.id=7630

Articles on Acoustics

Acoustic Treatment and Design for

Recording Studios and Listening Rooms -- http://www.ethanwiner.com/acoustics.html

Absorbtion Coeffecients -- http://www.bobgolds.com/AbsorptionCoefficients.htm

Absorbtion Coeffecients -- http://www.saecollege.de/reference_m...nt%20Chart.htm

Helmholtz Absorber -- http://www.mhsoft.nl/Helmholtzabsorber.asp

Room Acoustics -- http://www.silcom.com/~aludwig/Room_acoustics.html

Acoustical Room Treatment: A Survey of Methods and Materials -- http://www.hometheaterhifi.com/volum...04-part-1.html

Sound Waves -- http://www.isvr.soton.ac.uk/spcg/Tut...al/StartCD.htm

DIY Network's Acoustic Treatments -- http://www.diynetwork.com/diy/hi_fam...471072,00.html

Acoustic Room Articles (list) -- http://www.ecoustics.com/Home/Access...ment_Articles/

COF's (IG) Early Reflection Primer -- http://forums.soundandvisionmag.com/...hread.id=27061

COF's (IG) Early Reflection Primer II -- http://forums.soundandvisionmag.com/...hread.id=43449

a lot of reading material can be also found in more advance books,

(1) Science of Sound by Rossing

(2) Master Handbook of Acoustics (4th ed.)

(3) Acoustics by Leo Beranek

(4) Musical Acoustics by David E. Hall

*edit

Care of RuR here is his original post..here

Originally Posted by RUR

Here's a list of sites I've bookmarked over time of companies who deal in acoustic treatments. Some specialize in DIY, some are high-end, etc. etc. Almost certainly some have better products than others, so caveat emptor!

http://atsacoustics.com/
http://www.asc-hifi.com/
http://www.sweetwater.com/shop/studi...tic-treatment/
http://www.gikacoustics.com/index.html (popular with DIY-ers)
http://www.acoustimac.com/
http://www.echobusters.com/
http://www.realtraps.com/index.htm
http://www.rpginc.com/residential/index.htm
http://www.soundprooffoam.com/soft-s...ic-panels.html

and, FWIW, a very quiet forum on acoustics: http://forum.studiotips.com/index.ph...9eb8a30d757375

collective resources added:

http://www.etfacoustic.com/RPlusDSite/index.html

http://www.auralex.com/
http://www.atsacoustics.com/

added material 03/09
simple yet informative reading.
acoustics101

[jomari]

Save for future research materials

[jomari]

Yet another placement for research material

[RUR]

Wow! Thanks for furthering this discussion.

[jomari]

Originally Posted by RUR

Wow! Thanks for furthering this discussion.

this is definitely a great place for those clamoring for information.

no more spoonfeeding so to speak.

again, it doesnt hurt to ask for more, or a little bit of clarification here or there, but its always great to skim thru the material at hand, and then let us know how we can further help out.

[prerich]

Very nice thread - with a wealth of useful knowledge!!!! Thanks!!!

[Johk]

Thank you for all this useful information!

[fronn]

Myself and others (I'm sure) appreciate the effort Jomari!

I'm one of those that have been pushing for more education on room accoustics and treatments.

I certainly didn't have the time or patients to create this -- it looks like a great starting point (lots of information already).

Now lets just hope people put the information to use I will be digging through this stuff -- I'm sure there's quite a bit for me to learn as well.

[Riff Magnum]

Thanks for all the great info everyone.
Room treatments are a big part of the sound equation, and they tend to get overlooked by many.

[mdabb]

(((Room Acoustics Information)))


Acoustics: The Forgotten Component
http://82.95.237.142/mhsoft/RoomAcoustic.asp

Room Acoustics
http://blog.audiovideointeriors.com/howto/407how/

Room Acoustics(explanation)
http://en.wikipedia.org/wiki/Room_acoustics

Acoustics Calculator
http://82.95.237.142/mhsoft/user/aco...calculator.asp

Reverberation (explanation)
http://en.wikipedia.org/wiki/Reverberation

Reverberation Calculator
http://www.saecollege.de/reference_m...Calculator.htm

Standing Wave (explanation)
http://en.wikipedia.org/wiki/Standing_wave

Standing Wave Demonstration
http://www.youtube.com/watch?v=MPcJbb5Qfj0

Calculate Skyline Diffuser
http://82.95.237.142/mhsoft/DiffusorCalculator.html

Bass Trap (explanation)
http://en.wikipedia.org/wiki/Bass_trap

Make Acoustic panels for your recording studio or home theater
http://www.instructables.com/id/Make...ing-studio-or/

Jon Risch's Acoustic treatments page (website)
http://www.geocities.com/jonrisch/a.htm

Acoustic Science Corporation (website)
http://www.acousticsciences.com/

Article About Room acoustics
http://www.asc-hifi.com/articles/chain.htm

Room Acoustics:Acoustic Treatments
http://www.audioholics.com/education...tic-treatments

Modes, Modes And More Modes
http://www.asc-home-theater.com/modes-modes.htm

How To Build A Bass Trap Without Spending A Lot Of Money (Article)
http://www.supernova-music.eu/extra/...s_trap_en.html




(((Sound Proofing Information)))


Building Your Home Theater: Lay Out And Design / Ways To Keep Sound Isolated
http://blog.audiovideointeriors.com/howto/1106howto/

Soundproofing 101
http://www.soundproofing101.com/index.htm

Building A Soundproof Home Theater Room Within A Room
http://forum.ecoustics.com/bbs/messa...79/299683.html

Soundproofing Your Home Theater
http://forum.ecoustics.com/bbs/messa...79/288346.html

Soundproofing Home Theaters And Media Rooms
http://www.practical-home-theater-gu...ing-manual.pdf

Making Wall Quiet
http://www.practical-home-theater-gu...alls-quiet.pdf

Step By Step: How To Soundproof Your Home Theater
http://www.soundandvisionmag.com/tut...e-theater.html

Home Theater Revolution (video segment about soundproofing)
http://www.youtube.com/watch?v=EKezM6fPXIk

Sound Proofing Products
http://www.soundprooffoam.com/soundp...kA&lcode=AA132



______________________________


Any of the above info can added/used if wanted. There is more to come but not ready to be posted. This is just some of the things I had bookmarked along with other things already mentioned.

"crap Just realised there might be a couple duplicates."

[househead]

OK to post pics here, or move to another thread? I just finished 3 bass traps that I'm using on a shared wall in my townhouse. I'm currently using 2 on the wall to absorb some of the bass that travels through. So far the effect of the sound panels is incredible. The sound vibrating around that back wall has greatly diminished, and the bass response in the listening area sounds tighter than before (an after effect I wasn't expecting but greatly welcome )

I made the traps out of 1x4's, Roxul Mineral Wool, $2 "L" brackets from Lowes, $1/yd material from Wal-Mart and cotton batting. 3 Panels cost me less than $100 and were well worth it. Wish I could do more!

[RUR]

Very cool! Like you, I was amazed at how much of an improvement was obtained with even modest treatment. Placing bass traps in the room corners will have an even bigger effect upon bass "tightness". They can be triangular or circular in order to minimize room intrusion (and WAF).

I see lots of opportunity for H/F "glare" with the hardwood floor etc. Do you plan to treat the sidewall 1st reflection points and/or put a throw rug on the floor? Both are easy and can be relatively inexpensive.

[househead]

Originally Posted by RUR

Very cool! Like you, I was amazed at how much of an improvement was obtained with even modest treatment. Placing bass traps in the room corners will have an even bigger effect upon bass "tightness". They can be triangular or circular in order to minimize room intrusion (and WAF).

I see lots of opportunity for H/F "glare" with the hardwood floor etc. Do you plan to treat the sidewall 1st reflection points and/or put a throw rug on the floor? Both are easy and can be relatively inexpensive.

Oooh now you're talkin! Yup a cheap throw rug/carpet is on the agenda for when we do movies & music. I might do the side walls, but those would have to be removable since the wife won't let me mount anything the panels in the living room.

Corner bass traps sound good - thanks for the tip! Do they have an effect even behind my sofa? I'm amazed at what you can do for little money, if you want to get a little dirty/sweaty.

[RUR]

Originally Posted by househead

Oooh now you're talkin! Yup a cheap throw rug/carpet is on the agenda for when we do movies & music. I might do the side walls, but those would have to be removable since the wife won't let me mount anything the panels in the living room.

Corner bass traps sound good - thanks for the tip! Do they have an effect even behind my sofa? I'm amazed at what you can do for little money, if you want to get a little dirty/sweaty.

The side panels can be juiced up to look purdy, if you try!

Believe it or not, the general advice from acoutics experts is that all corners of the room should be treated for bass trapping - that's all wall/wall, floor/wall and ceiling/wall junctions. As a practical matter, few of us can actually do that, but I've found that treating only the four wall/wall junctions results in startling improvement.

[househead]

Originally Posted by RUR

The side panels can be juiced up to look purdy, if you try!

Believe it or not, the general advice from acoutics experts is that all corners of the room should be treated for bass trapping - that's all wall/wall, floor/wall and ceiling/wall junctions. As a practical matter, few of us can actually do that, but I've found that treating only the four wall/wall junctions results in startling improvement.

OK you convinced me. Did you make yours or buy them? Any pics? Thanks!

[RUR]

I bought mine and they are big and, to put it mildly, unattractive. Not all are this way, however. It's late and I'm tired so I'll post some less offensive examples tomorrow. Stay tuned!

[RUR]

OK, so here are the corner bass traps I use: http://www.realtraps.com/p_mondotrap.htm
I purchased the corner mondos with wall stands. Effective? You bet, but also big and not even remotely attractive, though RealTraps has recently begun offering them with nice fabric options (too bad I purchased before they began that practice ).

Here's a smaller type which looks like a better fit for your room: http://www.gikacoustics.com/gik_tri_trap.html
These, too, may be purchased with multiple fabric options.

Finally, here's what I'm considering as replacements for the rear corners: http://www.acousticsciences.com/tubetrap.htm
Cool-looking, multiple fabric options, but expensive.

To minimize costs, you can make your own tube bass traps. Here's a DIY site: http://www.teresaudio.com/haven/traps/traps.html
With some additional guidance in a related forum: http://www.canuckaudiomart.com/forum...pic.php?t=7878

and another: http://home.comcast.net/~jtgale01/diy2.htm

You could also consider making your own triangular corner traps a la the GIK Tri Trap link I've shown, but I couldn't readily find a DIY post on how to do this. It can't be hard. I'll keep looking and/or Rich or jomari or mdabb may know of one.

More later on H/F reflective panels for the 1st reflection points.

[mdabb]

Originally Posted by RUR

You could also consider making your own triangular corner traps a la the GIK Tri Trap link I've shown, but I couldn't readily find a DIY post on how to do this. It can't be hard. I'll keep looking and/or Rich or jomari or mdabb may know of one.

The only DIY triangular shaped one I know off hand. You can always adjust size accordingly. Shouldn't be difficult.........

http://www.supernova-music.eu/extra/...s_trap_en.html

[RUR]

Originally Posted by mdabb

The only DIY triangular shaped one I know off hand. You can always adjust size accordingly. Shouldn't be difficult.........

http://www.supernova-music.eu/extra/...s_trap_en.html

Thanks! The only ones I could find are on pepar's site and those are big, built-in and more suitable for a dedicated HT.

[richteer]

Originally Posted by RUR

You could also consider making your own triangular corner traps a la the GIK Tri Trap link I've shown, but I couldn't readily find a DIY post on how to do this. It can't be hard. I'll keep looking and/or Rich or jomari or mdabb may know of one.

Might be worth checking out the Echo Busters "Corner Buster". I've not tried them myself, but they were favourable reviewd in TAS a couple of years ago. $190 for four from Acoustic Sounds.