Grounding question for self-powered Subwoofer Installation

[JcEuErPt]

I'm putting in a new self-powered 10-inch subwoofer underneath the passenger seat. Slowly but surely, I've gotten power in, I've connected to the audio lines via an LOC, but I am just being cautious about doing the groundings correctly.
I have to ground both the subwoofer itself and the LOC (a small device that connects the subwoofer to the audio system by connecting the factory wires for back left and back right speakers to a simple +\- RCA line to the subwoofer.)

The LOC has IN lines for BL+, BL-, BR+, BR-, and out lines for Remote to Speaker, the RCA+/- to the speaker, and a ground line.

The self powered subwoofer has the RCA +\- line, the power IN, the remote from the LOC IN, and a ground line.

I've seen a few YouTube videos that show someone grounded to a bolt on the side of the body just next to the passenger side seat belt. Are there any other spots that people would suggest?

Also, I’ve read that it is OK to ground the two devices lines to the same location/spot on the frame. Has anyone done this?

Thanks for any assistance.

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[dstevens]

In order to prevent ground loops it would be best to ground everything to the same point as the signal source, which is the head unit or DSP if you're using one. Without a wiring diagram I can't tell, but why is there a separate ground for the signal input? Does it use the speaker outputs?

 

[JcEuErPt]

Thanks for replying. I tried to describe the wiring a little better and rewrote my question. My main question is which spots on the floor/frame around the passenger side seat can be used to ground to.

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