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Discussion Starter #1
I'm running 2 new 20A circuits - one for the PJ, the other for

the AV equipment. It is most convenient for me to run my subwoofer

off of the PJ circuit (they both are at/near the back of the of the HT).


Are there specific noise issues with the PJ that I need to be concerned

about affecting the Subwoofer?


It will be hard to run a line just for the Subwoofer....
 

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Well, I wouldn't. Here are a couple of reason's why.


1. The subwoofer (after a turntable) is probably the one piece of equipment most likely to have grounding issues. Really don't want that inline with the PJ.


2. Most HUM issues in an AV environment come from a mismatch between the ground potential of the audio system and the video system - specifically a satallite dish or worse yet, a cable box. In order to correct this, it is sometimes necessary to isolate those grounds from each other. This will be impossible if you have the PJ and the Sub on the same circuit.


It may be most convenient right now but might be a huge PITA later. Is it difficult to run a tap from the equipment closet too or just a whole new circuit?
 

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If the cableTV or satellite cables entering the building aren't properly grounded, properly ground them. It's a safety issue as well as a quality issue. That taken care of, if there are other issues that need to be addressed, address them. A properly wired system will have no problems with audio and video on different breakers. If there is a problem, fix the problem rather than avoiding it. AVSforum member Signal posted the following helpful sites. Dish and antenna masts have the same grounding requirements.



National Electrical Code - Search for "dish"

The information there also applies to antenna and cableTV grounding.
http://forums.nfpa.org:8081/necfaq/necsrch.htm


Preventing Damage Due to Ground Potential Difference
http://www.cinergy.com/surge/ttip08.htm


PSIHQ - Grounding Requirements
http://www.psihq.com/iread/strpgrnd.htm


PolyPhaser Technical Information
http://www.polyphaser.com/ppc_technical.asp


Tower Page - see N1LO's GUYED TOWER TOPIC SUMMARY
http://www.qsl.net/n1lo/tower.htm
 

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Discussion Starter #4
I have 3/4" conduit running from the panel to the PJ and

then from the PJ to the subwoofer location so I guess

I can just fish another line....


I don't know if I have a problem yet because I don't even

have my AV equipment. However, my house is old

and an electricians nightmare with two 200A panels,

multiple subpanels, several Cable entry sites, etc..


I'm just anticipating problems....
 
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