Will I benefit with 20 or 15 amp dedicated lines

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 .

I had 15 done, will use 20 the next time.

I can't understand why you need a 20 amp when your gear only uses about 500 watts. 1 amp= 110 watts so a 15 amp circuit is about 1700 watts; a 20 amp is about 2200 watts, it is like using a 5 amp fuse when you need a 1 amp fuse. You are better off having a breaker trip instead of frying your gear. I know of no audio gear that would ever draw that much current,but if it makes you feel better go ahead and do it!

I can't understand why you need a 20 amp when your gear only uses about 500 watts. 1 amp= 110 watts so a 15 amp circuit is about 1700 watts; a 20 amp is about 2200 watts, it is like using a 5 amp fuse when you need a 1 amp fuse. You are better off having a breaker trip instead of frying your gear. I know of no audio gear that would ever draw that much current,but if it makes you feel better go ahead and do it!
10-28-09: Yogiboy

The breaker is there to protect the branch circuit device, (receptacle), and the wiring... not the audio equipment plugged into it. The equipment has its own overcurrent protection.

As for the difference in cost between #14 awg wire and #12 awg the difference is miniscule. As I said in my earlier post most of the cost for installing the branch circuits will be labor.

And if by chance Kitegod would like to install Porter port receptacles on the end of his new branch
circuits he will be code compliant. It is against code to install a 20 amp receptacle on a 15 amp branch circuit.

Who can say down the road if Kitegod will upgrade his system. Maybe a bigger amp, or what ever.

The instruction booklets for both my Krell Amp and my JL Audio Subs recommend 20 amp dedicated lines. Go for the 20 amp line in case your equipment changes in the future.