From: david.brown@hesbynett.no   
      
   On 12/09/2025 19:23, David Schultz wrote:   
   > On 9/12/25 12:01 PM, George Neuner wrote:   
   >> You are forgetting the lower harmonics. If it is true about 3 lower,   
   >> then ~1/3 of notes on the piano will include an overtone that is below   
   >> the (average) hearing threshold.   
      
   Harmonics are always integer multiples of the base frequency, not   
   fractions - that's the definition of a harmonic.   
      
   You can get lower frequencies produced as beats when different   
   instruments play nominally the same note, but are a little out of tune.   
   That's not something you would normally want to have in music (though it   
   is a very useful effect for getting things in tune).   
      
   >   
   > One of the coolest things I ever heard, felt really, were the beat tones   
   > between a couple of peddle notes on the pipe organ at the Meyerson in   
   > Dallas.   
   >   
      
   Big pipe organs have notes that are too low for human hearing, but the   
   volume is enough to feel them.  Infrasound (sound below the lowest   
   audible frequency) has long been associated with feelings of   
   "supernatural" or "paranormal", increasing stress and tension.  Horror   
   movies sometimes like to have them in their soundtracks, and more than   
   one "haunted house" turned out to have issues with the plumbing,   
   ventilation or nearby diesel engines that produced infrasound that made   
   people feel uneasy without knowing why.  I'd imagine that for a church   
   organ, playing some infrasound notes will help the listeners feel   
   "religious" or feel some kind of "spiritual presence", though I have not   
   heard of that being done intentionally except by some of the more   
   dedicated fake healer conmen.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)