Jea,
I will agree that sound quality usually benefits from proper power conditioning. There are many ways to achieve that effectively. Best approach will vary case by case. A dedicated circuit can introduce its own problems associated with grounding as pointed out so it is not a panacea in of itself. Alone, even if doe right, it might not make any difference in any particular case just is it may in others.
I'd think about applying a power conditioner and perhaps noise limiting power cords to line level devices first in most cases. Of course one can take things as far as they want if they deem it worth it.
I will agree that sound quality usually benefits from proper power conditioning. There are many ways to achieve that effectively. Best approach will vary case by case. A dedicated circuit can introduce its own problems associated with grounding as pointed out so it is not a panacea in of itself. Alone, even if doe right, it might not make any difference in any particular case just is it may in others.
I'd think about applying a power conditioner and perhaps noise limiting power cords to line level devices first in most cases. Of course one can take things as far as they want if they deem it worth it.