Quoted from m111111:What is the easiest way to get line out / audio out jack from a WPC, WPC DCS , WPC - S ?
The easiest way that I have found is with Pinnovator's stuff. I have their outputs on all my machines feeding their mixer into a powered sub. They also make headphone outputs. Great customer service too.
https://pinnovators.myshopify.com/collections/all/products/pinsub-dcs-williams-bally-kit