solderdude
Grand Contributor
S/N ratio always decreases when the Signal is lower and the Noisefloor of the system remains the same.
When a different gain is selected the noise floor also changes.
Sure one can used very low noise pre-amps but would have a notch the measurement signal or make the signal small enough so it doesn't clip the pre-amp.
Amir doesn't have (or at least use) one of these so in the measurements shown here we are often looking at system noise floors.
There are tricks like averaging a signal so the noise lowers opposite the signal. Unfortunately this is just interesting for measurements our ears can only do that up to a point and use other techniques.
When a different gain is selected the noise floor also changes.
Sure one can used very low noise pre-amps but would have a notch the measurement signal or make the signal small enough so it doesn't clip the pre-amp.
Amir doesn't have (or at least use) one of these so in the measurements shown here we are often looking at system noise floors.
There are tricks like averaging a signal so the noise lowers opposite the signal. Unfortunately this is just interesting for measurements our ears can only do that up to a point and use other techniques.