The boombox in question is a Panasonic RX-5010ls (the one pictured is not mine), but it's pretty worse for wear and the radio was the only thing that worked (for about six months, lol) and parts of it are falling apart.
Plan is to take it apart, give it a good clean, and then work out how to wire the raspberry pi into the speakers. I'd like to keep the actual audio parts (as it does have volume, balance, and tone) but time and ability are factors. x3
I think to start with I should is just get the pi playing audio through the speakers and then measure how much power it all draws