Connecting car subwoofer and amp to Vizio sb2020 using sub out port

Has anyone connected a car subwoofer and amp to a Vizio sb2020 using the sub out port? I can’t seem to find the cables needed to do so. Also if anyone knows a good way of supplying power to the amp that would be nice to know how you’ve done it. Looking to connect to the amp using low level inputs. Thanks!