From: jl@glen--canyon.com   
      
   On Thu, 13 Nov 2025 15:44:26 +1100, Bill Sloman    
   wrote:   
      
   >On 13/11/2025 5:02 am, john larkin wrote:   
   >> On Wed, 12 Nov 2025 17:28:04 GMT, Jan Panteltje    
   >> wrote:   
   >>   
   >>>> john larkin wrote:   
   >>>>> On Wed, 12 Nov 2025 16:11:03 +1100, Bill Sloman    
   >>>> wrote:   
   >   
   >   
   >   
   >> The problem is to find an audio spectrum analyzer with -150 dB   
   >> distortion.   
   >   
   >Not if you filter out almost all of the fundamental before you feed the   
   >residual signal into the spectrum analyser.   
      
   You just shifted the problem to finding a filter with -150 dB   
   distortion.   
      
      
   John Larkin   
   Highland Tech Glen Canyon Design Center   
   Lunatic Fringe Electronics   
      
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