I have an old vintage radio that stands about 4 ft tall. I want to take out the old tube radio and replace with car radio and two new speakers. Also possibly a sub woofer and amp will be placed in it.. Any guidance on how to convert the car stereo to run all this on an 12v outlet plug. Also can I put my 12 '' sub woofer and 600 w amp in it and still sound good.... Answer me thanks :)