Read up on "the best bang for the buck" - you can access those wires in the door thru that little triangular shaped plug at the front.
I said 2 channel cause Mark ( pizzaguy ) said it. He has worked his entire career in electronics, recently years for Kenwood, so he should know.
Personally, I don't have a clue, and I still say radio/television is pure magic.
As to gettogethers, one is in progress now in Eureka Springs, Arkansas and is a yearly event.
The other is "the Tail of the Dragon" at Fontana Village in North Carolina, but that is in doubt this year as the place has closed permanently.