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I bought an in ground passive subwoofer and would like to connect it to my Amp. I ran 12 AWG wire from the sub to the Amp and then realized it was an RCA connector. Do I need to install anything between the RCA connector and the speaker wire? Or, do I just need to buy an RCA connector?

The Amp .LFE port requires connection to an ‘active’ Sub rather than ‘passive’ Sub…

See this link (page 3)…

https://sonoscenter.ru/upload/medialibrary/f80/8pr92jpftj3bcnzn6d4oqtw77f1cxr57/Sonos_Amp_Manual_en.pdf