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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: RE: read this: posted by sailor321 on June 8, 2007 at 05:11:52:
Audio systems have audio-band noise that is covered by your discussion. A quiet system with grounded equipment still has ground loops, but they do not inject much that we can hear directly.
Audio systems also have out-of-band noise that affects the audio signal indirectly. Higher frequency noise is inaudible, but can interact with the audio signal and produce spurious audio-band tones through intermodulation distortion. Some folks call this "RFI," but it is more precisely RF noise pollution (RFI is when a strong broadcast signal breaks through and is directly audible). RF pollution has a number of characteristic effects on the sound, such as bright, harsh, forward, flattened presentation, excessive treble energy manifested in spitty sibilants and mushy cymbals, a dry and disconnected midrange, and a vague bass.
The AC ground wiring in most USA houses carries some RF noise, and ground loops in the audio system can be antennas for it as well. I believe the improvement in performance some folks get when they install a dangerous separate earth rod is from reducing the RF noise from the main house ground wiring. It is not a good thing to do, but it is tempting when the user hears the sonic improvement.
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Follow Ups
- Some clarification on the topic of noise. - Al Sekela 16:46:04 06/08/07 (0)
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