A report just released suggests that people from housing estates talk louder in the street than for instance, someone from a leafy suburb.
According to the study there is a direct correlation between how well to do you are and the volume at which you communicate, this has other mitigating factors other than class, like proximity to a fast food outlet, for instance in this study, a McBurger fast food chain.
On a sliding scale of lower class person outside a fast food vendor, saw an increase in decibel level, where as a more affluent type would be quieter in close proximity to the burger purveyor but grow increasingly louder, the further away from said outlet they were.
The high levels of noise emanating from a lower class citizen outside a fast food franchise could be increased by adding one or more similar components, but it was noticed that the noise level in this instance appeared to have an accumulative effect. One would make the noise of two. Two the noise of four, and so on, although in most cases the coherence remained at pretty much the same level throughout.