![](/images/flag/s/en.gif)
Introduction To achieve the best performance in a high end chain, first noise and interferences must be reduced in all the parts and especially in the stages before power amplifier. In fact power amplifier will add his high gain to everything it sees at its input, that’s say of course the signal but noise and interferences too! We’ve spoken of noise and interferences because both work to reduce the performances but they are due to different mechanisms. Interferences are caused by external source