The original post pertains to speaker wiring so I'll keep it on that topic. Its very difficult to introduce radiated noise into a speaker wire like you would have with live-level RCAs. The exception would be the inductors in passive crossovers so their location in respect to engine management electronics and such would be important. In countless boat installations I can't recall a single instance in which we had to relocate speaker wiring due to noise. There simply isn't enough inherent gain in the noise source for speakers to pick it up. In contrast, you're seriously amplifying whatever minute level a line-level RCA picks up.
Thanks David. Really appreciate you taking the time to share your expertise with us.
Thanx David. I have spoken many great things about you here. Glad to see that you join. Your expertise is much appreciated.
Al, My sub wires run through the ski locker no problems . My Rca's are there also for my pac lc1 controller for my towers and they get a light buzzing signal. I will insulate with flex loom, replace the existing to better rca's or rerout them around the bow.
My two cents