You may wish to consider shielded coax with a stranded wire center terminated with RCA plugs, much like a good quality video cable, for this application, especially if your runs are quite lengthy or ...

Buy AmazonBasics 3.5mm to 2-Male RCA Adapter $6.99 2. iMBAPrice RCA M/Mx3 Audio/Video Cable This gold-plated cable is perfect for hooking up audio and video media, such as a DVD player, Hi-Fi, or ...

Manufacturer: Shielded Audio Review Date: December 31, 2020 00:00 MSRP: $ 45 - 3' to $450 - 20' First Impression: Gotta Have It! If you're looking for high end 'snake oil free' speaker cables, check ...

RG59 is just fine at 10 MHz and down. <BR><BR>You don't even need RG59 for the audio, either; any decently-shielded audio RCA cables will do fine - although you CAN use RG59 if you can find a ...

They're also pretty expensive: $15 for either the 1/8" to RCA or 1/8" to optical adapter, neither of which is very long (though they don't need to be).