typical residential noise floor range between 35 to 45 db (40 - 50 db per EPA). That would invalidate at least half of those results and more per EPA, no?
I would like you to have 50 dBA at home for a day, I'm sure you'd sue your neighbors.http://www.nonoise.org/library/levels/levels.htm
On the basis of its interpretation of available scientific information, EPA has identified a range of yearly Day-Night Sound Levels sufficient to protect public health and welfare from the effects of environmental noise. It is very important that these noise levels, summarized in Table VIII, not be misconstrued. Since the protective levels were derived without concern for technical or economic feasibility, and contain a margin of safety to insure their protective value, they must not be viewed as standards, criteria, regulations, or goals. Rather, they should be viewed as levels below which there is no reason to suspect that the general population will be at risk from any of the identified effects of noise.
Indoor activity inter- ference and annoyance Ldn < 45 dB Indoor residential areas
Levels to protect your health are not the same levels that you need for some activities like sleeping or studying or critical listening.
Turning up the volume (within reasonable range) can alleviate the background noise problem. Most of the participants didn't have problem with this (half way down) Benchmark and Behringer DAC comparison session. vvv
5) Has harmed you the atmospheric noise?
Let's be clear. You are googletranslating a webpage trying to put me as a "subjectivist" but I was there and I'll tell you my subjective vision.
Matrix is so called because they think they have "The Truth" and they offer you two pills, a red one and a blue one... and if you chose the blue you are called a "smurf". There's nothing between the absolute owners of the truth and the ******* smurfs.
At one time there were some interesting engineers and technical people inside Matrix but the owners wanted to demonstrate more and more and some people warned things weren't being well done, they became smurfs and villains, while the absolute owners of the truth began calling themselves "talibans". Nowadays the activity at the Matrix forum is almost absolutely offending that people (including me) and I'm really honored to be on "the list".
If you make a DBT at Matrix and you find differences they will never publish them (unless it is between tubes-transistors) so DBT are called "banderas de Japón" (Japan flags) because their mission is to laugh at any people who think he can find differences but can't.
The Japan flag is a beautiful metaphor of how your ass will look like after the DBT. That's the kindness and friendship of those scientists who enjoy surrounding you wearing black t-shirts while laughing.
So my biased opinion is that you should make your tests rather than defending other people's ones made on the other side of the world.