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Join Date: Oct 2003
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"This will give low wattage performance but says nothing about hiss at zero watts signal i think."
the slope of the line indicates the absolute noise floor to me because it says that as the signal is decreasing by 10db in power, the noise as a % is increasing by 10db, so the signal is just falling into the noise floor below 10 watts.
.003% = -90.5db so if connected to a speaker with 100db 1w1m sensitivity and given 10w, the signal would be 110db and the noise would be 20db and would not decrease no matter how much the signal went down.
if the power were lowered to 1 watt and the speaker produces 100db signal, and the noise floor was still at 20db, that would be -80db. -80db is 0.01% and that is what the distortion shows for 1w.
lower again the power to 0.1 watt and the speaker produces 90db signal, and the noise floor was still at 20db, that would be -70db. -70db is 0.03% and that is what the distortion shows for 0.1w.
lower the power all the way to 0 and the speaker produces 0db signal and the noise floor is still 20db.