PSW 108 Subwoofer - Not properly working

I have this product, and for some reason not working properly. I have it connected to a Yamaha AV receiver, and passed the subwoofer test while I was setting it up. (not as loud as I thought it could be).
What when I play any sound from any source (TV, Spotify, Netflix) subwoofer doesnt make any sound.
I have it connected with an RCA cable (red & white), while on the other end, only the red (or white) go to the receiver.
Thoughts?
Thanks in advance to whoever that can help me

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