As long as the RCA cable is shielded, it should work well. Many of the people that use our subs use Monoprice/Mediabridge/etc cables and they work quite well. You don't need to go out and get anything expensive. Decoupling feet is probably not needed in many cases, and if it is, you can probably get a throw rug/yoga mat to accomplish the same thing. You can always temporarily place the sub on top of the foam tray that is included with the sub to see if it makes a difference.
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