[SOLVED] issue with subwoofer

Dec 22, 2019
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i have 2 speakers and a Yamaha YST SW012 Subwoofer which came with a subwoofer cable. in hopes of getting them both to work as a 2.1 setup i bought a sound card and found out upon arrival that all ports, including the sub port, were 3,5mm. i bought a RCA-to-3,5mm jack converter for the subwoofer cable yet the subwoofer is still not recognized
the subwoofer itself is functional and is powered directly from the wall.
anyone know why?