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Getting loud hum from subwoofer

mmaatt747
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I purchased these Ceres C4.5Bt speakers:

 

http://www.newegg.com/Product/Product.aspx?Item=9SIA18T3MJ5032&cm_re=ceres-_-9SIA18T3MJ5032-_-Product

 

I connected a powered subwoofer to the Sub Out port on the back of these speakers.  But I get a REALLY loud hum from the sub.  I thought it might be the sub so I tried another powered subwoofer and it does the same.  The Sub Out port is a 1/4 stereo jack port.  So I'm using the adapter that came with it that changes it from a 1/4 in. headphone jack to RCA and using an RCA cable to connect them to my subwoofer.

 

I read on their troubleshooting guide that a hum can be cause by a ground loop and that you should connect the power of the sub to the same power as the speakers.  But they are so that is not the issue.  I'm using a short RCA cable that is not running near any power cables so that's not the issue either.

 

Does anyone have any suggestions?

CPU: AMD Ryzen 7 7800x3d  Motherboard:  Gigabyte B650 AORUS Elite  RAM:  Vengeance 2 x 16GB DDR5 6000   GPU:  Zotac RTX 4090

Storage:  M.2 Samsung Evo 860 TB / Samsung Evo 840 500GB   Case:  be quiet Dark Base 900   PSU: Corsair SHIFT RM1000x  Display:  ASUS AW3423DW QD-OLED 34" 3440x1440 Ultrawide w/ GSYNC

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