2-I myself have it done a Sony DVD Player it has a MP3 socket
3-/4-I rathered JBL 20cm the 2 are just under the cockpit helm seats
5-The protections are extra price as known , I didn't want them.And I am still very happy without them.
6-2X120 amp and 1x 90 amp
7-I dont have microwave
8-In my ex boat ( oc 373 ),microwave runs only with shore power..