Originally Posted by bjizl
I'm just gonna be running a single DAD BD 10. She's never gonna turn it up loud so it will never pull a lot of current I guess.
How many watts are you planned on running, is what I should've said, and is there a chance of upgrading to bigger/better equipment?
If so, get the 0ga so you can do it right the first time and not have to run new wires. You can run 1/0 to a distro block and then 4ga to amp so you have the option to upgrade if you want.
If not, the 4ga will do plenty and you won't have any issues plus it's real good wire. This, obviously, is the simplest answer but there are many possibilities so try and think of future plans for your wife and decide off of that.