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In Reply to: RE: The nameless 'engineer' 's piece posted by Sprezza Tura on October 24, 2014 at 11:16:22
Would that you were right...
Rick
Follow Ups:
It's not a question of musical signals passing thru but a case of harmonic and intermodulation signals passing to and from the mains into the signal path
"It's not a question of musical signals passing thru but a case of harmonic and intermodulation signals passing to and from the mains into the signal path"
Well... I'm not convinced of that. While I agree that power harmonics are often problematic I believe that having the power system as a partial signal path is also.
However, what I was speaking to in this case is that at the least the signal modulates the power input because it's output is encoded via varying energy delivery.
Rick
2.3GHz Satellite connected to mains degrades sound; 6% thd in London on the mains degrades sound; pulling broadband modem from mains improves sound.
In my 3 systems.
Oh I agree with you Fred, I suspect most of our gear has an insufficient PSSR to fend off today's environment. Maybe even yesterday's but at least at my place the line now looks gross. I'll do a recheck one of these day as it's been a few years since I eyeballed it but I doubt it's improved... I'll send send you a picture but with adequate warning that you can avoid looking at it near mealtime. Here in the Wild West, the land of entrepreneurs, loose laws and capacitor input power supplies, we all want our's off the top...
But my point was that it's impossible to not add to the misery with our stereos. Any device whose power requirements fluxuate with a signal will modulate the power input. "Voltage sources" are an ideal, a limit, not something that really exists except by definition. In addition actual baseband signals also couple along the same paths causing no end of grief.
I think line-powered audio gear has an especially tough row to hoe because the power fundamental and all of it's significant harmonics are in-band. And the users happen to be equipped with very keen sensors that can detect oddities down into the noise floor if they are uncorrelated with the signal.
But it's a lot better hobby than watching football on TV...
Rick
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