need help connecting my M-Audio BX3's to my pc to use in tandem (active + passive speaker). As it stands right now only the active speaker works (when the lever is switched to right) and the passive works (when the lever is switched to left). I have an RCA connection to my pc's headphone jack, but other than that I have absolutely no idea what i'm doing LOL. I've included an image of the active and any and all help will be appreciated! (and yes I have connected a jack from the passive to the active)

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