Originally Posted by hoffmand34
Thanks for all the feedback and education. Maybe it would be less abstract to address this seemingly impossible topic in context of an actual theater room. I happen to have one handy
Take a 14x19x9 room with the seats 2ft from the rear wall and no false wall at the front. I already have 4ft long 17x17x24" 3lb/cuft superchunks in the upper rear corners. I will add full height 17x17x24" superchunks in the front two corners. I have not considered facing the superchunks because my room is still pretty "live". I have three 24x48x2" fiberglass panels spaced 2" off the rear wall and two 1" panels spaced 1" off the side walls.
I'm trying to get REW up and running but that has a bit of a learning curve.
What, if anything, should I do with the front wall? Is it all hopeless without actual ETC measurements? If I don't have that capability it seems like there should be some generally accepted treatments that are more effective than just doing nothing.
If you are adding superchunks to the front wall for broadband bass traps, consider making them bigger at 24" x 24" x 34", and using pink fluffy instead of OC703/705. There are multiple threads on that.
Also, consider to face the front side with reflective material, unless you have a specific issue that needs addressing by absorption of those reflections.
How'd you determine the location of the side and back wall panels in your room presently?
Why do you think your front wall needs treatment?
In all the posts in this thread - some really good stuff in it all - simply its not clear to me that you do have a acoustic problem that you are addressing.
Can you take 5-10 minutes and look at this link, easy to see visually the various small room models, it's 7 pages from the book "Acoustics and Psychoacoustics Applied"http://eetimes.com/design/audio-desi...n?pageNumber=0
You have REW, and a measurement Mic already?
So you've made some $ investment.
REW is your objective data toolset, my advice is don't give up.
I've had my learning curve on REW, but once you get past the initial set-up people will help with the graphs/measurements.
Look at this thread a dummy's guide on setting up REW
I also have a thread on ETC, Using energy time curve for acoustic analysis: developing a Home Theatre primer
. , -that is NOT done yet.
Due to other "life stuff", like being cubscout leader for my boys group, my astrophotography hobby (lack of sleep), etc, that was put on Hold for a re-boot.
Come spring, when I re-do my 130" screen due to humidity induced warping of the screen
, I will totally remove all my existing side wall/ceiling panels and start from baseline of no treatments on the room
(besides my corner superchunks, which all have front facing reflective treatment on them)
I also will do the following:
-Pure reflective room baseline
-baseline of "the mirror tricK", as I did, with side wall 2" panels + 2" air gap
-Pure ETC approach and using 4" panels + 4" air gap at specific locations verified by ETC
-compare and make objective and subjective assessment
All above is being done utilizing porous absorbers.
Come 2014/2015, when it's new PJ time (4k +LED light engine), and I go AT front screen - with DIY L/C/R main speakers in a baffle wall, then the whole HT acoustic treatment strategy will change; diffusion, membrane absorbers, etc....but that's topic for a different thread, not buried in yours.
Long winded post, I'm a learner in acoustics, but like to learn based on reading, taking objective data, etc.
Finally, I like to summarize all that for sharing, for me its the only way I can remember something, try to share with others.