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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Thanks for the thorough explanation posted by lrcordell on June 23, 2007 at 23:44:16:
Two of the duplex outlets are labelled "digital AC outputs," and the other two are labelled "analog AC outputs."
I interpret this to mean there is passive filtering between the output of the regenerator (essentially, a high-powered audio amp delivering 120 volts at 60 Hz) and the "digital" outlets. This will keep much of the noise from the digital gear out of the equipment plugged in to the analog outlets.
You are correct that this device should take the place of separate dedicated AC lines, since it will have very low output impedance and reduce the conversion of equipment current waveforms into noise. To do this successfully, the feedback approach it uses should have very wide bandwidth. If it is band-limited in its feedback, it will allow cross-coupling of the higher frequency components of the equipment-generated noise.
I expect the safety-earth connections are continuous from the input through to all the outlets, regardless of how they are labelled. This means RF noise on the safety-earth will be shared among all the equipment pieces, and the ground loops created by the common safety-earth connections will remain intact. Being a species of audio amplifier, the EP-15A itself may generate RF noise and add it to the incoming noise and noise from the connected equipment.
Passive filters for reduction of EMI and RFI typically contain small capacitors that connect the hot and neutral to safety-earth. These capacitors have very high self-resonance frequencies, so they are effective at coupling RF noise from the hot and neutral to the safety-earth. The safety-earth is NOT a ground for RF noise, as the true connection to the earth is a long distance away in most cases. Thus, how much the EP-15A helps your audio system performance depends on where the major sources of RF noise are located, and their spectral composition.
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Follow Ups
- The EP-15A web page shows two banks of outlets. - Al Sekela 10:36:07 06/24/07 (0)
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