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In Reply to: Yep posted by Ted Smith on January 2, 2007 at 14:23:29:
Hi Ted ... whew! 8 dedicated lines for your hi-fi ... and that's not enough!! :-oI have one dedicated line and am contemplating more but I had heard a theory that plugging part of the system into one circuit and the rest into another may cause noise? Not necessarily loud mains-loop hum but a higher noise-floor, anyway?
I take it this is not your experience?
Regards,
Follow Ups:
HowdyIt's complicated :) Two separate circuits (each perhaps with other things on it) definitely can cause problems, especially if they are on different phases. But N dedicated lines on the same phase gives a very quiet noise floor.
My experience with my system when it was simpler was that there was value having my digital separate from my analog. Also there was value having amp(s) and sub separate from other things. In my old house with my MC system when I upgraded to three 750 W mono-blocks in the front (and a stereo amp for the rears) I discovered that I need more dedicated lines.
Also I have "controversial" grounding: I have a big honking wire from the main panel to the local box and then star grounding to each outlet. I also have two sets of grounding rods, one up at the main panel and another at the local panel. The system is up to code here, but I don't know about other places. Also I didn't design it, there's a local electrician who does a lot of audiophiles houses and he knows what seems to work the best for various situations in our area.
My biggest problem is that I have two Tivos in my system which require telephone and satellite hookups. (I also have DSL.) So my multiple groundings (phone, satellite and AC power) is a serious problem. I used to have some ground hum when I turned the system up 30 or 40 dB higher than I normally listened, some Jensen isolation transformers for my S-Video connections to the Tivos fixed that. I still have a little trouble with the HDMI connection, but I unplug it for critical listening and plan to get a gas discharge ground interruptor for the satellite ground which will fix everything.
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Hi Ted
Happy new year btw.
A GDGI is an excellent device for portecting your equipment from over voltage spikes and lightning discharges etc, but how is it going to solve your earth loop problem with the satellite boxes HDMI connection?
wouldnt grounding that box at your local ground point solve that ? - but I guess you would have already tried that, otherwise my best guess would be to galvanicaly isolate the HDMI connection.Well cool about the number of dedicated lines running thro that plumbing -"thats the way to do it".
HowdyThe idea is that the satellite isn't grounded except by the signal cables in normal use, i.e. no ground loop. When there is more than 70V (or whatever) between the satellite and it's local ground then the tube conducts to that ground and only then would there be a ground loop.
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