What you want can be done easily--and cheaply. There's plenty of cheap, good used speakers around, integrated amps, isolation transformers and line conditioners.
Get a cheap, used line conditioner (like a Monster 1000, although I would recommend a Tice for video). Plug a couple small isolation transformers to it--one for DVD, one for the Proton. Use contact cleaner/ enhancer like Pro Gold, some decent speaker wire and you'll be set.
Get a cheap, used line conditioner (like a Monster 1000, although I would recommend a Tice for video). Plug a couple small isolation transformers to it--one for DVD, one for the Proton. Use contact cleaner/ enhancer like Pro Gold, some decent speaker wire and you'll be set.