I also installed 2 dedicated lines for my 2-channel. Go with the 10-gauge. Using a bigger section won't be hazzardous in any way. Your electrician might be thinking you are wasting money, or might be lazy, as you say.
I suggest you go ahead and get 2 dedicated lines. The labor to have 2 instead of 1 is not twice as much, and it is generally accepted that keeping digital and analog on different circuits is better. You don't want this itch in 6 months...then it will cost you more!
I suggest you go ahead and get 2 dedicated lines. The labor to have 2 instead of 1 is not twice as much, and it is generally accepted that keeping digital and analog on different circuits is better. You don't want this itch in 6 months...then it will cost you more!