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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: Re: Almost certainly not posted by Ted Smith on February 21, 2007 at 14:57:54:
<< A switching supply may have more immunity to incoming power line noise, RF, etc. than a linear supply. >>I would have to say that any such immunity would be minimal, at best.
Let's look at the example of the power line "regenerators" sold by some. They (at least in the case of the original models) consisted of a conventional audio power amplifier, fed by a 60 Hz oscillator, and then with a step-up transformer to raise the output levels to normal AC line voltages.
The idea behind their operation was intellectually appealing, but only on the surface. The premise was that one could have "pure" AC power. But if the ordinary power amplifier used in the "regenerator" was somehow able to filter out the RFI present on the incoming AC power line, then why couldn't the audio power amp that was driving the speakers themselves do the same thing? Because if it could, there would be no benefit whatsoever from the power "regenerator". So (as is often the case) the proffered explanation was not necessarily correct or complete.
Similarly, if you look at what happens to the incoming AC power as it makes its way to the audio amplifier itself, there is really very little difference between a linear supply and a switching supply in terms of RF rejection. In fact, one could easily argue that the better high-frequency response of the switching transformer (compared to the 60 Hz transformer in a linear supply) would bring in *more* interference (in addition to the noise generated by switching supply by itself).
<< switching supplies aren't necessarily evil >>
No, of course not. But I would say when equal care is applied to both technologies, that a linear supply will provide superior sonic results. Please note that this does *not* mean that everything with switching power supplies sounds bad. It just means that they would probably sound even better with a really good linear supply.
This last statement is kind of like saying that since really good polystyrene capacitors sound better than really good mylar capacitors that any component using mylar capacitors (no matter how good it may or may not sound in stock form) could be improved by switching to polystyrene capacitors. (But of course in the real world, polystyrene capacitors are more expensive than mylar caps. So it might make more sense to put that money somewhere else to get even more improvement.)
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Follow Ups
- Re: Almost certainly not - Charles Hansen 15:33:45 02/21/07 (2)
- Re: Almost certainly not - Ted Smith 15:51:58 02/21/07 (1)
- Re: Almost certainly not - Charles Hansen 16:13:49 02/21/07 (0)
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