Hi!!
I've got a very large window directly to my left in our control room. It is causing some nasty high frequency flutter from the opposing wall. The room isn't particularly large either. I was wondering if this http://www.ebay.co.uk/itm/160657406078? ... 1423.l2649 car 'acoustic material' would be do the job in reducing the early reflections from the window?
Marc
Acoustic Material for control window
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Soundman2020
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Re: Acoustic Material for control window
Hi Marc. Please read the forum rules for posting (click here). You seem to be missing a couple of things! 
Regarding your question: No, that stuff won't do anything to kill first reflections. It is way too thin, and doesn't have the open-cell structure that is needed. The best solution is to buy a panel of Owens Corning OC-703, 4" thick, cut it in half (vertically), and put one half on each of the side walls, at the first reflection points. If you can't find OC-703, then ordinary mineral wool or fiberglass insulation will do. The most important thing is that it mus be thick: 4" at least. You can make it more effective by spacing it away from the wall as well. For example, leave a gap of 2 or 3 inches behind it.
- Stuart -
Regarding your question: No, that stuff won't do anything to kill first reflections. It is way too thin, and doesn't have the open-cell structure that is needed. The best solution is to buy a panel of Owens Corning OC-703, 4" thick, cut it in half (vertically), and put one half on each of the side walls, at the first reflection points. If you can't find OC-703, then ordinary mineral wool or fiberglass insulation will do. The most important thing is that it mus be thick: 4" at least. You can make it more effective by spacing it away from the wall as well. For example, leave a gap of 2 or 3 inches behind it.
- Stuart -