-I'm amazed by the 40+ dB delta between the light blue and dark blue. Is this attributable solely to cable length and connectors?-
It's not so surprising when you work out the maths: - Those plots are calibrated, so if you take the worst case scenario of a change from around -145dBV to -80dBV, from light blue (as you say, measured at the regulator) to the top magenta trace, that represents only around 1mV of noise, give or take a few nV. For ease of maths, make the current consumption 1A (it's actually lower than this) and using good old Ohms law, we can see than the impedance that represents is: - R=V/I = 1e-3 / 1 = 1mOhm, not a lot, really! Remember these are sensitive measurements, that reveal tiny voltages and as alluded to before, they don't necessarily correlate directly with sound, that depends more upon the nature of the noise and what it's correlated with and what the noisly supply feeds. They also exclude all the stuff above 90kHz or so, that I can't measure ;) Andy. -- Andrew L. Weekes _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
