makes perfect sense to me - so here's the question, now that you know what you know, are you going to leave it there?
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While tweeks to room acoustics can produce wonderful results, one must consider aesthetics, as well. Is it really worth having to stare at an ugly blown up mattress placed between your expensive speakers just because it improves the sound? I realize the main priority of this hobby is to achieve sonic nirvana, but at what cost? No, I am not laughing at the idea; I'm sure it does improve the sound somewhat, but I am scratching my head in wonder.
IMHO what you tried was really a "quick and dirty" bass trap. I had something similar happen when I put a big bag of pink fiberglass (in the unopened bag) in the corner nearest my rack. Esthetically horrible but acoustically nice. So now I think you have an idea of how a bass trap (and maybe some diffusion) could improve your listening room.
That is great! I love stories like this. A friend of mine has a nice older system with some Energy Conoisseur C8 speakers. We were listening to it one day and there were some rather obivous bass modes rearing their heads up. Laying on the floor were a pair of poufs and we thought of putting them in the corners behind the speakers. The difference was clear - pun intended! We were surprised at how much difference they made.
Makes perfect sense, which #1 the sueded surface helps knock down the reflections behind your head, and the Air in such a contained capacity is the best bass damper you can find, Air cavity. Or a big fuzzy couch will do this with less of an obstruction :-) Room acoustics are everywhere, it is really more simple, just finding the right furniture and location is the hard part!
I agree with Aball completely. I love stuff like this and I'm absolutely not laughing. Got a small asymmetric listening area in a finised basement ... alcove with wall corner near my left channel speaker, open on the right channel. We've got an air matress. If that one's too big I may just buy a smaller one. I'm not opposed to taking it up and down when I listen. I looked at DIY base traps seemed like a lot of work and not easily hidden. An inflatable mattress solves a couple of problems. Thanks, Chadnliz.
Type in "acoustic foam" on eBay's search bar. There's a Canadian company making Auralex knock-offs(the original is also avaiable there). Their 2" X 24" X 24" squares, and Bass traps(just like the LENRDs) do wonders for room acoustics. They can be installed with latex caulk(removed or moved easily). They'd look MUCH better than two inflatable mattresses leaning against the wall!