you want to talk a little something interesting regarding the world of sound. As I wondered what it was for the phase reversal on my preamp, I investigated further, and I discovered that in a situation stereo, a partial reversal of the sign of a canal, undo some of the dynamic range of sounds, if the inversion undo them is total.
In particular it is useful to know for example when recording with a microphone above and one below a snare drum, where the signals will necessarily what reversed.
Well, things not to believe, but the math does not make a wrong here either. If you record two sinusoids with a recording program (I used audacity)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjkCJ0esSzrsIwV6SSTaYRD-b-630_ecpSZx8X9yH6ZmR3tn7fesVQ8dGP28GtqCaDIxBSVMyuWOWZHyia74ZJwAhNeuaLJSQEbJww0yTLaINNUXAnxvlJzBjYRuHu4YIxO35pQDKB7iDc/s320/Butta.bmp)
and the reversed phase, pressing play, not feels absolutely nothing! (Note the empty spectrum analyzer, a track start)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhCAnGoFINaznjpm631P4La5YjuhDvYrx9vHPLlH2BkZpc2OiON5td5oXTF7nEI881s-Aw8M1YTdYAs6aQ9kRNf1jSYPyTed9HI4WSCaAM35WJlHLsiwV1KqPxIES2cE6pMhzAnAV8e2WA/s200/Butta.bmp)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhsWxUH4wRFrtEdCuL-N2sWJvMN_sAI4ZdMGpemEazN-yTJBfgTKJAbMBbdn6Ieukt4GYmzKE1SOMavE0VJXssuzZRsS0Un7ECNzEQa-2iYdyid6yXgzAc3gzBvgYfgO9YfbodgRViM3PQ/s200/Butta.bmp)
Again, if the two tracks mixed into one channel, the result will be that!
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZ4ygbcK982F5ljPXuvgtH09YIWD1xU8SxxozMEYn6ww9aKJoMnw0ZZcYkvbeJSTAF94tABDVbK5UmPzxk1lfzDIQu3GH8w2crDxdMQU-O69PSyliM22nAla20UPA5cER2nKB5B56BWso/s320/Butta.bmp)
No tricks no deception: at every instant of time the signal amplitude of a channel is coupled with its negative corrispetitvo (+ x-x = 0).