You can use 8awg, but you are only going to get stranded wire...
That's not true, you can buy 8 gauge Romex that is solid.
Dedicated 20 Amp Line for Audio
Lots of threads on the subject already, but I’m a little confused on one thing. Is the dedicated line just for the amplifier (in my case an integrated) and another line for the other components? Or, is it just one line for everything in the complete audio system?
Thanks!