From: user5857@newsgrouper.org.invalid   
      
   David Schultz  posted:   
      
   > 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.   
   >   
   > 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.   
      
   Have you listened to a helicopter-style sub-woofer ??   
      
   Generally housed between stories in a building--a helicopter arranged set   
   of blades, that can go all the way down to 0 Hz--and up to about 30 Hz.   
   The low frequency components adjust the pitch of the blades through the   
   cyclic.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)