Thanks. 
 
I cannot move the speakers much but I do think the 12L's are shielded.  The big problem is that I am getting noise (much more out of one that the other) no matter where I plug them in the house (away from computers, etc.), with no source, and with no volume.  I can live with the slight hum I hear from the "left" speaker but the "hiss" that I get from the right speaker is driving my nuts.  I have contacted Lane so we'll see what he says.    
 
Thanks for all the help.