|Originally posted by 3F05Q |
I'm a physicist, I'm quite familiar with it. "complete a full cycle" is fine. By "compression to refraction" you mean 'rarefaction', which is a decrease in density, and compression to rarefaction would only be a half-cycle.
Your earlier statement: "so you wont hear it at its loudest unless your 10 feet away" would only apply to a situation in which there is a standing wave with a wavelength of 10 feet (a wall n10+5 feet away where n is a positive integer, for instance). Otherwise, the loudest point would be at the source. For a point source, the intensity drops as 1/r^2, while the sound pressure decreases as 1/r. look it up.
I'm not talking about wierd situations in rooms with objects and a sub on the floor, blah blah blah, and perhaps it's a difference in context that is leading to a misunderstanding. I'm not versed on room treatment and behavior like some here are, which is why I wouldn't attempt to discuss such specific scenarios. As many have taken the time to educate me, I like to return the favor where I can.
If you'd like to discuss anything further, drop me a PM, I'm beginning to feel like a threadjacker.
To put it more clearly, the Inverse square law.
Sound intensity is inversely proportional to square of distance.
For the doubling of distance from the point of origin, the SPL drops by 6 dB.
One thing to note is that the Inverse Square Law applies to point-and-shoot speakers.
Line array speakers are another story.