4-in 1-Out RCA 3.5mm AuxAudio Switch Box Audio Converter 4 Channels 1-in 4-Out Passive Audio Selector Switcher Box Connectors (RCA+AUX 4IN-1OUT/1IN-4OUT)

Non powered rca aux switch box I got this one. It’s decent https://a.co/d/0282IA44

Consider one with more inputs, so you dont end up in the same seat as now again. Afaik some of the cheap ones can be so-so quality. Stuff like mute and volume are completely pointless and just reduces quality. https://a.co/d/0ckuUvtq That one seems ok.