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Discussion Starter · #1 ·
I am aware that when speaker wire and electrical wire are run close to each other a humming sound might be generated in the speakers, especially when power is run through that electrical wire.


Unfortunately, my house is not new construction so in 1 particular area I had to run speaker wire where 2-3 BX shielded (not Romex) wire is. I am hoping BX wire since it is metal, can shield the electrical wire better than Romex and avoid the 60hz hum that some electrical wire may cause.


Does anyone know if my assumption is correct or not?
 

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Somewhere in the following papers is a test of hum fields from different AC power cable types.

Both papers are different edits of the same information.


"The TRUTH" from ExactPower of Middle Atlantic Products
http://www.exactpower.com/elite/wpapers.aspx


or a long version of the same paper


"Power White Paper" from Middle Atlantic.com
http://www.middleatlantic.com/power.htm


But in general speaker cables don't pick up hum, easily.


Don't be TO neat with your cables.

Put a twist in every 4 to 6 inches,

Same goes for AC Romex on NM cables.
 

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Discussion Starter · #3 ·

Quote:
Originally Posted by Speedskater /forum/post/16995877


Somewhere in the following papers is a test of hum fields from different AC power cable types.

Both papers are different edits of the same information.


"The TRUTH" from ExactPower of Middle Atlantic Products
http://www.exactpower.com/elite/wpapers.aspx


or a long version of the same paper


"Power White Paper" from Middle Atlantic.com
http://www.middleatlantic.com/power.htm


But in general speaker cables don't pick up hum, easily.


Don't be TO neat with your cables.

Put a twist in every 4 to 6 inches,

Same goes for AC Romex on NM cables.

Thanks for the articles. I was VERY concerned because I had no choice but to run all my speaker cable by BX wire. I was hoping the metal shielding the BX wire would eliminate any hum and I feel alot better now.


The ultimate test will be when I get this project done and fire up some music through these wires but I was paranoid.
 

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Let's reiterate, shall we?


1) Speaker cable runs relatively high voltage. It will pick up a certain amount of induced voltage from unshielded power cables, but the voltage is so low it can't be heard. IOW, no hum.


2) BX cable is shielded. It can't induce voltage in the speaker cables. IOW, no hum.
 
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