Figuring system powering can be very tricky. The best way to do it is with some kind of software. I used an old dos program called Cable Design to to all of my power designs. It works pretty good, but takes a while to do it. I don't have a copy of it anymore, i left it with the last company i worked for.
You should be able to get your amp draw info from magnavox. Give them a call.
Then you need the dc loop resistance of each type of cable. You can get this from trilogy, or out of an rd-15 or SA data book. 750 is somewhere around .78 per 1000 ft. 500-1.8 per 1000 ft.
Re: amperage draw
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