re: Two channel audio/cd 'hi-fi' on a budget

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That said, I do have an old passive 12" sub that I probably got 20 years ago (speaker surround may be degraded, idk). Could I use this in the meantime or would I be doing a disservice to my new setup? It is an Optimus Pro SW-12 (tag says 8ohm 100 watts).

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Sure: you use a second set of speaker wires and run from the amp’s powered terminals —-> sub—-> speakers.

I’d recommend hooking it up both ways to see which way you like best.