Stereo Troubleshooting (noise/feedback through amp powered speakers only)
Okay I'm going to try and lay this out as much as I possibly can to narrow down my issue.
Problem: Noise through the tower speakers only (amp powered, zx200.2 powering stock towers, and dx200.4 powering 2 polks)
I am exactly wired up with Al's diagram, nothing different, other than I have a 3 bank Prosport charger individually wired to the three batts. (page 2 of link below)
https://forum.moomba.com/showthread....R-Combo)/page2
After wiring the ACR and three batts, I later installed a new HU Kenwood KMR 440 as well as a KCA RC 107MR remote. Everything was working perfectly (no noise through speakers, happy sounding boat). I then installed a Krypt KMA 4200 EQ, wired it up correctly and again everything was good. And by good I mean speakers had no noise, the eq worked fine, the boat sounded great! Went up to Lake Sammamish to meet up for the pro surf comp, I put the boat in the water, we started our treck out boarding, but I noticed none of my tower speakers were working. The Krypt 4200 eq was shot (blowing fuse after fuse)... that is a different story but in all the eq was done, so instead of not having tower speakers all day, I decided to just use the old RCA cables that I still had in the port compartment, plugged them up, just how I had them plugged in before I installed the Krypt 4200 eq, and that is when I started experiencing a lot of noise, so much to the point I couldn't use the towers at all. (by noise I mean hissing, w/ boat turned on or off, krackling, just about the worst noises you ever want to hear out of a speaker) So for the day I just disconnected the RCAs and carried on with my day.
Lately I've been trying to do a little troubleshooting and me being an ME, not an EE or stereo tech, need some other options to explore. So far I have tried wiring my HU ground to the amps ground, that didn't work, I was still experiencing noise. Next I went through my wiring, checking for any loose connections, still nothing and I continued to have noise. I've tried my old HU and installed that and also had noise. I've tried different RCA cables of higher quality, not super expensive but not cheap ones either, nor are they ground isolated RCAs and still had noise. I've also seperated power and ground wiring from the RCA's and also experienced noise. What else... stereo bank batteries are fully charged, the zx amp is older but the dx amp was just taken out of the box brand new so I'm ruling out the amps are bad.
While I'm troubleshooting the boat is sitting in my driveway turned off, either plugged in to AC charger or not, I've tried messing with keeping the Prosport plugged in and unplugged, that doesn't seem to mess with anything. I would still like to try different RCA cables than the ones I have thinking that may be it, but before I buy more I figured I'd try and ask the forum, maybe some of you have had similar issues or have some different options to explore. I will be receiving a new Krypt 4200 eq and am hoping that putting that back it will fix the noise but it may not get here in time for our week long vacation with the boat next week. I would hate to not have my tower speakers for a week, so please any ideas, suggestions, shoot them at me. Thanks