XPost: alt.comp.os.windows-10, alt.home.repair, sci.electronics.design   
   From: wolverine01@charter.net   
      
   On 1/3/2023 8:24 AM, Arie de Muijnck wrote:   
   > On 2023-01-03 11:10, Clive Arthur wrote:   
   >> On 03/01/2023 02:30, Brian Gregory wrote:   
   >>> On 02/01/2023 13:48, Rink wrote:   
   >>>> If you change the wires of one speaker you get a 180 degree   
   >>>> difference on all audio frequencies.   
   >>>> If from two speakers at the some radio (left and right), one is wrong   
   >>>> connected, you can hear that at exactly the middle between the speakers   
   >>>> where there is a fase-out for all audio frequencies.   
   >>>   
   >>> I've never heard an audible null between out of phase speakers. It   
   >>> usually just ruins the stereo effect, makes it sound almost like two   
   >>> separate lots of music (or whatever).   
   >>>   
   >> With a mono source (ie both channels the same phase) you lose a lot of   
   >> bass in the centre.  Block one ear and the effect is clearer and at   
   >> higher frequencies too.   
   >>   
   >> A long time ago, when stereo records were often mixed with the vocals   
   >> in the middle and other instruments to the sides, inverting one   
   >> channel and adding it to the other channel (ie subtracting it) could   
   >> do a not-too-bad job of removing the vocals for karaoke.   
   >>   
   >   
   > Yesterday I tried to check if the internal pick-off from my new TV to   
   > better speaker boxes was properly wired. Hard to hear. Left/right check   
   > was no problem, but phasing was hard to hear (I'm deaf, -60 dB on one   
   > ear). Even with a single speaker, and a swept tone, I got dead spots   
   > from wall reflections.   
   > An old trick solved the problem: put the two boxes very close, front to   
   > front, and test with a mono signal. Improper phasing removes most of the   
   > sound, proper phasing gives full volume.   
   >   
   > Arie   
   >   
      
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