Help trouble shooting sub hum

I have my subs run off my speakers using a banana to rca cable off the bi wire posts on the speaker.

I am not sure I am understanding how you are saying that you have your subs connected to the system. You are going from your amp to your speakers and then from your speakers to your subs? I connect my sub using RCAs out of my preamp, but typically isn’t the alternate way to go to use speaker wire FROM amp out TO the sub(s) and then speaker wire FROM sub(s) TO speakers? Anyway, that’s the way the diagram shows it in my own subwoofer manual, but maybe that varies by manufacturer?

using a banana to rca cable off the bi wire posts on the speaker

. . . and I am certainly no expert, and I may be mistaken, but I don’t think that connecting a signal (either from a speaker OR an amp) from the speaker wire binding posts to an RCA 'in' jack via speaker wire will work the way it is supposed to, will it? I mean, generally when you run speaker wire from amp to sub you don’t connect to the sub’s RCA jacks; I am thinking that to run speaker wire to a sub, the sub has to have speaker wire ’in’ connections?

You really need to read your owners manual.  You have this hooked up incorrectly.  You can tap into the speaker terminal but you need to run that into the HI level input of your sub, not the low level via an RCA input.

Your system profile says you have L12 subs.  From what I can tell from the Rhythmik website, they do not have high level inputs, which is how you’ve tried to connect them.  You need a low level output from your amplifier/integrated into the low level input of your subs. As others have stated review your owners manual for correct connection.

This is a hot mess.  You want to use a converter like this one.