Definitely 20A. circuits with the 12g.wire w/ground . Use copper not aluminum wire .
And I would suggest that you have them installed with an isolated ground . That would be a seperate ground from the rest of your electrical system with the grounding rod at least 6ft. away from the original . This will assure that you do not get any noise from other things in your home as mentioned above . This is the type of grounding system used in hospitals and computer rooms . You may need to hire a 'commercial' electrician to find one with experience with this type of grounding system . I did .
Just Google isolated grounds so that you will know what is involved with the installation procedure . It is not that difficult , just different .
Oh , and having two seperate lines will allow you to seperate your digital items from your analog items .
Good luck .
And I would suggest that you have them installed with an isolated ground . That would be a seperate ground from the rest of your electrical system with the grounding rod at least 6ft. away from the original . This will assure that you do not get any noise from other things in your home as mentioned above . This is the type of grounding system used in hospitals and computer rooms . You may need to hire a 'commercial' electrician to find one with experience with this type of grounding system . I did .
Just Google isolated grounds so that you will know what is involved with the installation procedure . It is not that difficult , just different .
Oh , and having two seperate lines will allow you to seperate your digital items from your analog items .
Good luck .