Americanaudiophile, thanks much for the quick, detailed, and helpful reply!
I'm visiting my dad later this week; I'll verify the inputs/outputs of his current stuff and suggest one of the three options you've noted.
Thanks again!
tl;dr: Would any home theater setup be able to support both a Chromecast Audio (3.5mm jack) and a turntable (I presume w/ RCA?)?
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So... my dad has a TV, CD player, DVD player... and, yes, a turntable. Right now, he has it all hooked up to a very old receiver, which in turn connects to a...