Stutopia Posted October 19, 2013 Share Posted October 19, 2013 After my HFCs went on I took her for a rare drive with the stereo off to hear the new sound. I noticed there's a high pitched whine from the rear which matches exactly to engine RPM, upto about 3k then exhaust covers it up. It's tricky to investigate single handed as you can't hear it at idle, but the other day she was cold and idling at over 1k and I got a chance to have a listen. Seems to be coming from rear left speaker only, whose cable coincidentally runs alongside the reverse cam signal and video leads I popped in recently. Given the match to engine revs, the rev cam install and it being one speaker only, I'm assuming it's alternator whine, interfering with speaker cable. I changed the grounding point for the cam, with no improvement. I really don't want to have to upgrade the cam wires to shielded, as routing them was a PITA. Lesson learned for future though. Anyone had similar and solved? Is it possible to shield the cables with something like aluminium foil or tape? Is there something else it might be? Any ideas would be appreciated. Ta. Quote Link to comment Share on other sites More sharing options...
Stutopia Posted October 20, 2013 Author Share Posted October 20, 2013 Bump, as I'm gonna have a play around with this today. Quote Link to comment Share on other sites More sharing options...
spursmaddave Posted October 20, 2013 Share Posted October 20, 2013 Check you have a good Earth Stu that would be my first port of call. If thats fine then check any connections and make sure those are shielded mate Quote Link to comment Share on other sites More sharing options...
Stutopia Posted October 20, 2013 Author Share Posted October 20, 2013 I picked a random nearby bolt at first, but shifted to the big one my amp has, no change. I'm fairly sure it's cross talk from something. At least I know how the trim comes out now Quote Link to comment Share on other sites More sharing options...
spursmaddave Posted October 20, 2013 Share Posted October 20, 2013 I picked a random nearby bolt at first, but shifted to the big one my amp has, no change. I'm fairly sure it's cross talk from something. At least I know how the trim comes out now Good luck, could just be one speaker wire that is the culprit..... annoying but will be nice when sorted Sent from the Jaaaaaag at the golf club YAAAARRRRRRRPPPPPPPPPP Quote Link to comment Share on other sites More sharing options...
Stutopia Posted October 20, 2013 Author Share Posted October 20, 2013 Applying the principles of my favourite science, physics, I formulated a complex theory on EMI and purchased some clip on ferrite cores. I fitted these to the speaker wire, as close as I could without disturbing anything, minimal effort. Did nothing. Applying the principles of my favourite emotion, rage, I ripped out all the trim and snapped a few trim clips, pulled a load of cables as far away from each other as possible and taped them down with ally tape. Zero thought applied. Solved it. I'm now whine free, well, at least until I get to work in the morning. How does it know to rain when you get the very last hit of trim out? On the plus side, it's much easier to clean and nanolex trim it when it's in a big wet pile in the shed. Quote Link to comment Share on other sites More sharing options...
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