RFI can be super-imposed or "ride on top of" other AC frequencies and also DC. Better designs make use of "bypass caps" in the power supply, which should drastically reduce the effects of RF on the AC lines. Some designs, such as Bryston's, are supposedly insensitive to power cord changes.
If you study the design of Bryston products, they make use of the aforementioned "bypass caps" across the rectifiers. This serves two purposes. First of all, it helps to reduce the amount of RFI that finds its' way into the circuitry and it also helps to smooth out some of the ripples and harmonics generated from within the AC to DC rectification devices themselves. As such, this is a beneficial approach that is desirable. Sean
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PS... I am not suggesting that Bryston products are the best available. I am simply commenting on a single aspect of their design. I chose this brand as others here have commented on their lack of sensitivity to power cord changes and i was able to verify the design of their power supply via schematics that are published on the net.
As i've mentioned before, there isn't anything that one can build into a power cord that shouldn't already be built into the component that you're connecting it to. The bigger the difference a power cord makes, the more under-designed that component is. In this respect, i would say that Bryston is at least as good and probably better than most products out there.
If you study the design of Bryston products, they make use of the aforementioned "bypass caps" across the rectifiers. This serves two purposes. First of all, it helps to reduce the amount of RFI that finds its' way into the circuitry and it also helps to smooth out some of the ripples and harmonics generated from within the AC to DC rectification devices themselves. As such, this is a beneficial approach that is desirable. Sean
>
PS... I am not suggesting that Bryston products are the best available. I am simply commenting on a single aspect of their design. I chose this brand as others here have commented on their lack of sensitivity to power cord changes and i was able to verify the design of their power supply via schematics that are published on the net.
As i've mentioned before, there isn't anything that one can build into a power cord that shouldn't already be built into the component that you're connecting it to. The bigger the difference a power cord makes, the more under-designed that component is. In this respect, i would say that Bryston is at least as good and probably better than most products out there.