Originally Posted by stuckin96
I've since been reading that speaker cable in particular is not typically effected by interference emanating from nearby AC power cables.
At least 3 reasons:
(1) Big signal voltages
(2) Low impedances at both ends
(3) Floating (ungrounded) differential line receiver.
It seems the sub woofer cable is very prone to interference.
I presume you mean the line level (RCA) cable from the subwoofer output of the AVR or equivalent.
(1) only nominal signal voltages which can be too low if the gain control on the subwoofer is not properly adjusted. Set it as low as you can and still have good dynamic range.
(2) Medium impedances at both ends
(3) Grounded, unbalanced, single-ended line receiver.
(4) Load by nature has lots of sensitivity at the same frequency as power line hum.
Last night I had this sub cable (using RG6 in case nobody followed) at least 1.5 feet away from the AC cable, except where I terminated it in a metal receptacle box on a stud that had an AC receptacle directly on the other side at the same height. Someone today suggested I GROUND the receptacle box for the sub cable - literally connect that box to the ground screw inside the AC receptacle right beside it (?).
One safety rule is that everything metal that you can touch should be connected to safety ground.
Am I making too big a deal out of this or not? Originally I thought someone taking a first glance at my wiring/grouping would commend the clean layout and thoughtful (ha!) distribution/placements... Now I'm worried about Frankensteining my theatre room and the first person looking to buy my house years down the road is going to take one look and say this all has to be torn out and rewired b/c my AC outlets are way too close to all the A/V outlets. Obviously if its going to sound like crap (hissing & popping) that's going to be a total disaster :S
However, a safe installation often just naturally looks good.