moto_man,
Do not get disappointed if your attempt to instill appreciation for better sound does not work out to be all that you hoped for. I did something similar, even downgraded along the way to make it simpler, and the outcome has been...iPhone speakers. With a little luck, your stepson may appreciate the sound of movies through his new set-up. Maybe you are more successful, but I am afraid...
Do not get disappointed if your attempt to instill appreciation for better sound does not work out to be all that you hoped for. I did something similar, even downgraded along the way to make it simpler, and the outcome has been...iPhone speakers. With a little luck, your stepson may appreciate the sound of movies through his new set-up. Maybe you are more successful, but I am afraid...