comments:
Istartedthewar posted on r/vintagecomputing1w
No firsthand experience with one but looks like it uses an RCA to F-type coax cable. Full cable- https://www.amazon.com/edYutou-Adapter-F-Type-Connector-Extension/dp/B0CM6VJDGD/ Or just an adapter so you can use the cable in the picture you uploaded https://www.amazon.com/Connector-Coaxial-Converter-Compatible-Subwoofer/dp/B0DZTTJYRR/