Is no amplifier.
Or for example connecting speakers where headphones are to be connected.
Or using a milliWatts class A (electrons flowing all the time) power amolofie which is easy to make.
Or listening to so low volume with our amp that when we sing without any effort we hear ourselves as loudly as the reproduced singer.
Pitch perception (how high a note is perceived by our brain) depends not only on frequency but on acoustic intensity too. At low acoustic power levels we might as well perceive the correct pitch and not a flat one.
Would this so low acoustic intensity method help? Is this one of the reason those who really love singing might have perfected themselves? Were they also rehearsing when their parents were sleeping at ultra low volume?
Reference:
Sound and Hearing - S.S. Stevens, Fred Warshofsky - Life science library
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