From: '''newspam'''@nonad.co.uk   
      
   On 11/12/2025 09:14, Jeroen Belleman wrote:   
   > On 12/11/25 00:06, Don Y wrote:   
   >> On 12/10/2025 7:25 AM, Liz Tuddenham wrote:   
   >>> Martin Brown <'''newspam'''@nonad.co.uk> wrote:   
   >>>   
   >>> [...]   
   >>>>   
   >>>> ISTR that in the Three Mile Island disaster they spent the first   
   >>>> fifteen   
   >>>> minutes of the emergency trying to silence all the different damn   
   >>>> alarms   
   >>>> that made it impossible to think in the control room. Only once they   
   >>>> had   
   >>>> the noise under control could they communicate with each other across   
   >>>> the room.   
   >>>   
   >>> I worked in a university where they had just one sounder for each floor,   
   >>> mounted at the end of a each corridor.  They had made it loud enough to   
   >>> be heard in the laboratories with all the doors shut.  It would have   
   >>> been safer to climb out of a window than enter the corridor and try to   
   >>> escape past the sounder.   
   >>   
   >> You can get 200-300dB klaxon's relatively easily.  I had one in   
   >> college that was "fun" (for some perverse definition of "fun")   
   >> to play with.   
   >> [...]   
   >   
   > You may want to think that over. 200dB is like a rocket launch,   
   > close up. 300dB would be 10^10 times more powerful.   
      
   I suspect a bit of specsmanship here with them stating power in dB as if   
   the thing generated white noise when it is at a single frequency.   
      
   Shades of "peak music power" and other consumer conning metrics.   
      
   You have to be very careful testing loudspeakers with sine waves - it is   
   surprising how bad a mechanical resonance can be even at low powers.   
      
   --   
   Martin Brown   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)