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The Jensen JS650 does not accept line level input so you need to use the Front B speaker output from your Sony receiver and not the RCA subwoofer output. Even though your subwoofer is active, it does not support line level (RCA) signals.
Just connect the subwoofer as you would a pair of speakers. Once connected, you make sure the front panel speaker switch on the Sony is set to A+B so you get sound from your existing speakers (A) and subwoofer (B).
Many things can be happening to cause this noise: loose connections; ground loops; speaker cables smashed, etc. Disconnect all sources and speakers, clean plugs and connectors, make firm connections, be sure of the energy quality at your home. Most sound noises come from fluctuations on voltage and energy. Consider to invest on a power conditioner. Good Luck.
Try connecting it to the left or right output from the amp to make sure the speaker actually works. It might be the receiver that's the problem. Also, you must be in one of the surround sound modes on the receiver and not the "phantom" mode as it does not give output to the center channel.