If you have a box built inside the wall or ceiling then it will be easy to see where the wire should come out. The confusion comes when there is no box, just a coiled up wire, that is when it needs to be clear with the drywallers what the plan is. If they pop a hole and pull the wire out the wrong spot, you might be the person patching the hole when you move the wire to the correct location.
As far as running parallel to high voltage lines, 3 foot is extreme for speaker wire, you can get much closer without any interference. Chances are you can run it right next to 120V for the entire run and not get any noise. Usually running it in the next joist or stud bay is more than adequate, 12"-16" is plenty of space. The only requirements for speaker wire is that it is of a large enough size and it's rated for in-wall use. The electrons won't care about anything else, there is no shielding or super duper technology required, any of that is simply snake oil. Copper is at an all time high (trust me, we just paid $65,000 for a reel of 500MCM feeders), there is no need to spend even more money on a fantasy.
Line level is what you need to be careful with since it hasn't been amplified yet (and when it's amplified down stream the noise will be amplified too) so good shielding is a must. For subwoofers, typical RG-6 will work fine, go with quad shield if you are anal. I've wired hundreds of houses with Belden 7915A Tri-Shield without a single hiccup, it's excellent coax and at a great price. It will work well for cable and satellite feeds, audio and component video, etc.
As far as running parallel to high voltage lines, 3 foot is extreme for speaker wire, you can get much closer without any interference. Chances are you can run it right next to 120V for the entire run and not get any noise. Usually running it in the next joist or stud bay is more than adequate, 12"-16" is plenty of space. The only requirements for speaker wire is that it is of a large enough size and it's rated for in-wall use. The electrons won't care about anything else, there is no shielding or super duper technology required, any of that is simply snake oil. Copper is at an all time high (trust me, we just paid $65,000 for a reel of 500MCM feeders), there is no need to spend even more money on a fantasy.
Line level is what you need to be careful with since it hasn't been amplified yet (and when it's amplified down stream the noise will be amplified too) so good shielding is a must. For subwoofers, typical RG-6 will work fine, go with quad shield if you are anal. I've wired hundreds of houses with Belden 7915A Tri-Shield without a single hiccup, it's excellent coax and at a great price. It will work well for cable and satellite feeds, audio and component video, etc.
























