From: jrwalliker@gmail.com   
      
   On 11/12/2025 12:30, Don Y wrote:   
   > On 12/11/2025 5:14 AM, John R Walliker wrote:   
   >>> If *it* was advertised as "200 dB", would you doubt their   
   >>> claim (even though no one would realistically evaluate it   
   >>> at 1 ft in a "weather alert system")?   
   >>   
   >> That device would produce a sound pressure level of about 167dBspl   
   >> at 30cm from the source.   
   >> I would certainly doubt a claim of 200dB.   
   >   
   > What's it do at 1 cm?  Or, do we just pretend there is an   
   > absence of effect at distances closer than 30 cm?  Why   
   > 30 and not 10?  Or, 500?   
      
   In the case of the horn system you mentioned there is a   
   public address mode.  For that to work without gross   
   distortion there is a fundamental limit of about 191dBspl   
   when the negative peaks of a sine wave go to zero pressure.   
   This applies even inside the horn.   
   The system however has 18 horns, so at short distances   
   it becomes impossible to come up with a meaningful   
   measurement.  Where do you measure from?   
      
      
   > My point is, that is a "respectible" manufacturer targeting   
   > a "knowledgeable" community.  If they had chosen to   
   > extend their data to shorter distances, they aren't   
   > "making stuff up".   
   >   
   > Consumer markets operate under entirely different assumptions.   
   >   
   > What makes one "aspirin" more expensive than another?   
   >   
   > If I tell you that this screwdriver is hardened to Rc 65,   
   > would you purchase it over another hardened to Rc 64?  66?   
   >   
   > Why do you purchase one brand of "batteries" over another?   
   > Is there any reliable data on their capacities?  Have you   
   > done any specific research?   
      
   I avoid Duracell because I have found that they leak more often   
   than other brands that I have tried.  I do sometimes test the   
   capacities of batteries, especially if I am about to buy a large   
   number.   
      
   >   
   > Ivory soap claims to be "99.44% pure" -- why aren't other   
   > soap manufacturers marketing "99.45% pure" products?   
      
   Sometimes there are regulatory limits to the claims that can   
   be made.   
      
   John   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)