From: look165@numericable.fr   
      
   Generally, the "+" is near a red dot.   
      
   Anyway, the most important is that both speakers are in phas, connected   
   the same way.   
      
   John Larkin a écrit :   
   > On Sat, 8 Sep 2018 18:13:28 -0700 (PDT), Phil Allison   
   >  wrote:   
   >   
   >> Jasen Betts wrote:   
   >>   
   >>>   
   >>>   
   >>> Play an asymetical signal. One that does not have glide reflection   
   >>> symmetery, eg: 33% PWM  use a low low frequency so that the cross-over   
   >>> doesn't mess it up too much.   
   >>>   
   >>> view the sound on an oscilloscope (or audacity etc)   
   >>>   
   >>   
   >> ** Make current pulses in each speaker using a battery, 1.5 V to 6V.   
   >>   
   >> Use a mic or small speaker attached to a pole and view output on a scope.   
   >>   
   >> The resulting asymmetrical sound pulses will be the same polarity when the   
   wiring is correct.   
   >>   
   >>   
   >> ....   Phil   
   >   
   > How about connecting the speaker leads to a dual-trace scope and   
   > making a pressure pulse in the room. Slam a door. Pop a balloon.   
   > Firecracker.   
   >   
   >   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)