I am running outdoor direct-burial wire for a speaker system I am installing at my neighborhood pool. I am going to use Atrium 55 speakers. Because of a large concrete slab, I have to make one of the speaker runs about 380 feet. Basically, my starting cable point is at 7 o'clock and the furthest speaker is at 3 o'clock. If it weren't for the slab, I could go directly to it in less than 150 feet. My runs are as follows:
Spk1: 20 feet
Spk2: 100 feet
Spk3: 210 feet
Spk3: 380 feet
I was planning on using 14 gauge for the two short runs and then move to 12 gauge for the two longer ones. I then decided that it would be easier, although a tad more expensive, to just use 12 gauge for all 4 speakers. I read somewhere that for greater than 250 feet, 10 gauge should be used. I am getting mixed advice on what I should be using. I am worried about sound quality, but because it is in a large outdoor pool area, the sound quality is not going to be that great anyway. Dropping some highs and lows are okay in this application.
My question to you all is to determine what gauge wire I REALLY need to use and will I have a problem with the 380 feet run regardless of the gauge I use.
Any advice would be great.