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Originally Posted by djgizmo  - I see there was a lot of name calling back and forth. I'm a nobody special here and even I know that it's one thing to disagree with someone, its another to start calling someone names.
- The wife and I are buying a house and I've have the go ahead to floor my studio room anyway I choose (within budget reason). I'm willing to rip up the carpet in area (should be a 19'x11'x9' area) and stain the concrete. Once stained, I'm willing to run whatever tests that have been determined valid on the stained concrete room. Once finished, I'll start the process of laying down some kind of wood laminate flooring (which WILL include foam vapor barrier) and I'll run the exact test again. I'll post video/pictures of the entire process. I'll get myself a Nady CM100 and whatever test software that would be needed. My room would be treated with broadband absorbers to help eliminate room defect issues.
- One thing I've read about, and I'm not sure it applies. Doesn't refraction play a role in acoustics at this level? Like others has pointed out, concrete/cement is usually physically colder than wood. This usually causes the air just right above the concrete to be colder, therefore slightly denser. Sound has the tendency to want to stay near denser medium. Wouldn't that affect the speed / bend of the sound which in turn would give it a different RT60. If that is true, then just measuring absorption coefficient response would not be enough as it doesn't measure the speed of the sound.
- I guess since most wood flooring isn't rigidly mounted, wouldn't that cause an issue with difference of sound vs cement. Maybe causing a resonance somewhere?
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All great points, and all things that I agree probably have a significant impact. Whether it's audible or not is another matter, but I suspect that in large enough room it definitely would be.
Frank