There is a 12v 35ah battery in the prototype that's been touring the country.Considering it has a regular 12v battery in the frunk. I would imagine any standard automotive amp would work.
I could be wrong but all of the interior (dash/lights/windows/seats) plus the exterior (headlights/taillights) are still all 12 volt or they would have had to upgrad these parts on the entire f-150 family. They are using the same parts across the board. They are also going to be using all these same parts on the lightning as this is how they controlled costs and are able to have the price they are.I don’t know how you would go about doing that because the 12 volt system is only connected to the battery and the generator/starter.
From what I understand, on the powerboost, they converted the entire truck’s electrical system to 24 volts which runs entirely off the EV battery and inverter.
I guess it would be a lot easier to add a 110 volt amp to a powerboost than attempting an automotive 12 volt amplifier. I guess some automotive amps might accept up to 24 volts, but I’ve been out of that scene for some time now, so I’m not sure.