Upgrading electrical-things to do?

Since you have an "long run" then a larger gauge than #12 wire is needed to realize the beneifts of reduced surge impedance. Your electrician won't comprehend this, but absolutely insist that at least #10 gauge be installed, or even #8 for a long run such as that.

Holderlin:
My run is not that long and 12 ga. was not good enough in spite of my amp not been that big, go with heavier gauge.
One point many times overlooked is the main entrance to your house/apartment electrical system. Depending on type of wheather and age of the wiring system, you might have less than ideal contact there, so since the electrician will be working at your home, ask him to clean all connections that lead to your new panel, breakers, etc....
You might get surprised on having more light out of your bulbs and therefore better current flow to your beloved target area which is your sound system!!!!!!!
Hope the investment satisfies you when done.
Luis

Contact your local building department before installing or performing any major changes to your Electrical Service. Also, contact the Licensing Board for the Electrician and verify that the number matches the person doing the work. When dealing with Contractors…CYA